Advent Planet 2025http://www.lenjaffe.com/AdventPlanet/2025/2025-12-31T00:21:27-05:00Len JaffeXML::Atom::SimpleFeed2025-12-25http://www.lenjaffe.com/AdventPlanet/2025/2025-12-25.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p>Perl Advent: appears to be unavailable on 2025-12-25. Please try again later.</p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p>Perl Weekly Challenge: is available <a href="http://lenjaffe.com/AdventPlanet/2025/2025-12-01.html">12/01</a>-<a href="http://lenjaffe.com/AdventPlanet/2025/2025-12-24.html">12/24</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/25/">Raku Advent: December 25, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/25/">HTML Hell: Abbreviations done right: The &amp;lt;abbr&amp;gt; element and why not use it - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/25/">AdventJS: AdventJS - Reto #25: Execute the magical language - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p>Advent of Code: appears to be unavailable on 2025-12-25. Please try again later.</p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/25">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day25">Advent Of Craft: 2025/challenges/day25 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-25T00:00:00-05:00len jaffe2025-12-24http://www.lenjaffe.com/AdventPlanet/2025/2025-12-24.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-24.html">Perl Advent: Perl Advent Calendar 2025 - Pecan's Tale: Migrating a terminal application from Term::ReadLine to Tickit </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-24/">Perl Weekly Challenge: Advent Calendar - December 24, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/24/">Raku Advent: December 24, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/24/">HTML Hell: The three semantics of HTML - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/24/">AdventJS: AdventJS - Reto #24: Check if trees are magical mirrors - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p>Advent of Code: appears to be unavailable on 2025-12-24. Please try again later.</p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/24">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day24">Advent Of Craft: 2025/challenges/day24 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-24T00:00:00-05:00len jaffe2025-12-23http://www.lenjaffe.com/AdventPlanet/2025/2025-12-23.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-23.html">Perl Advent: Perl Advent Calendar 2025 - A Quick Response </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-23/">Perl Weekly Challenge: Advent Calendar - December 23, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/23/">Raku Advent: December 23, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/23/">HTML Hell: For the Love of &amp;lt;details&amp;gt; - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/23/">AdventJS: AdventJS - Reto #23: Gift route - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p>Advent of Code: appears to be unavailable on 2025-12-23. Please try again later.</p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/23">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day23">Advent Of Craft: 2025/challenges/day23 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-23T00:00:00-05:00len jaffe2025-12-22http://www.lenjaffe.com/AdventPlanet/2025/2025-12-22.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-22.html">Perl Advent: Perl Advent Calendar 2025 - Bit vectors save space on Santa's list </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-22/">Perl Weekly Challenge: Advent Calendar - December 22, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/22/">Raku Advent: December 22, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/22/">HTML Hell: The HTML Elements Time Forgot - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/22/">AdventJS: AdventJS - Reto #22: The sleigh maze - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p>Advent of Code: appears to be unavailable on 2025-12-22. Please try again later.</p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/22">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day22">Advent Of Craft: 2025/challenges/day22 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-22T00:00:00-05:00len jaffe2025-12-21http://www.lenjaffe.com/AdventPlanet/2025/2025-12-21.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-21.html">Perl Advent: Perl Advent Calendar 2025 - The Gift of Readability </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-21/">Perl Weekly Challenge: Advent Calendar - December 21, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/21/">Raku Advent: December 21, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/21/">HTML Hell: Styling by Language: Using the lang Attribute for Multilingual Design - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/21/">AdventJS: AdventJS - Reto #21: The cleaning robot - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p>Advent of Code: appears to be unavailable on 2025-12-21. Please try again later.</p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/21">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day21">Advent Of Craft: 2025/challenges/day21 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-21T00:00:00-05:00len jaffe2025-12-20http://www.lenjaffe.com/AdventPlanet/2025/2025-12-20.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-20.html">Perl Advent: Perl Advent Calendar 2025 - How SUSE is Using Perl </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-20/">Perl Weekly Challenge: Advent Calendar - December 20, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/20/">Raku Advent: December 20, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/20/">HTML Hell: The many lives of the page title - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/20/">AdventJS: AdventJS - Reto #20: Vertical warehouse - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p>Advent of Code: appears to be unavailable on 2025-12-20. Please try again later.</p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/20">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day20">Advent Of Craft: 2025/challenges/day20 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-20T00:00:00-05:00len jaffe2025-12-19http://www.lenjaffe.com/AdventPlanet/2025/2025-12-19.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-19.html">Perl Advent: Perl Advent Calendar 2025 - Advent of the Underbar </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-19/">Perl Weekly Challenge: Advent Calendar - December 19, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/19/">Raku Advent: December 19, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/19/">HTML Hell: Semantics beyond the tag name - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/19/">AdventJS: AdventJS - Reto #19: Santa&#x27;s Secret Journey - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p>Advent of Code: appears to be unavailable on 2025-12-19. Please try again later.</p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/19">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day19">Advent Of Craft: 2025/challenges/day19 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-19T00:00:00-05:00len jaffe2025-12-18http://www.lenjaffe.com/AdventPlanet/2025/2025-12-18.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-18.html">Perl Advent: Perl Advent Calendar 2025 - Safer last-minute hotfixes before Christmas </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-18/">Perl Weekly Challenge: Advent Calendar - December 18, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/18/">Raku Advent: December 18, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/18/">HTML Hell: Forms are a badly designed part of HTML - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/18/">AdventJS: AdventJS - Reto #18: Lights in line with diagonals - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p>Advent of Code: appears to be unavailable on 2025-12-18. Please try again later.</p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/18">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day18">Advent Of Craft: 2025/challenges/day18 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-18T00:00:00-05:00len jaffe2025-12-17http://www.lenjaffe.com/AdventPlanet/2025/2025-12-17.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-17.html">Perl Advent: Perl Advent Calendar 2025 - The Elves Learn to be Lazy </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-17/">Perl Weekly Challenge: Advent Calendar - December 17, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/17/">Raku Advent: December 17, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/17/">HTML Hell: Don't leave the screen reader hungry - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/17/">AdventJS: AdventJS - Reto #17: The Christmas lights panel - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p>Advent of Code: appears to be unavailable on 2025-12-17. Please try again later.</p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/17">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day17">Advent Of Craft: 2025/challenges/day17 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-17T00:00:00-05:00len jaffe2025-12-16http://www.lenjaffe.com/AdventPlanet/2025/2025-12-16.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-16.html">Perl Advent: Perl Advent Calendar 2025 - Auto-instrument your code with OpenTelemetry </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-16/">Perl Weekly Challenge: Advent Calendar - December 16, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/16/">Raku Advent: December 16, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/16/">HTML Hell: Giving pages a clear shape by using headings - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/16/">AdventJS: AdventJS - Reto #16: Packing gifts for Santa - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p>Advent of Code: appears to be unavailable on 2025-12-16. Please try again later.</p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/16">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day16">Advent Of Craft: 2025/challenges/day16 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-16T00:00:00-05:00len jaffe2025-12-15http://www.lenjaffe.com/AdventPlanet/2025/2025-12-15.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-15.html">Perl Advent: Perl Advent Calendar 2025 - Using Mojolicious::Plugin::Mount to help test your applications </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-15/">Perl Weekly Challenge: Advent Calendar - December 15, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/15/">Raku Advent: December 15, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/15/">HTML Hell: Thems the Breaks - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/15/">AdventJS: AdventJS - Reto #15: Drawing tables - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p>Advent of Code: appears to be unavailable on 2025-12-15. Please try again later.</p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/15">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day15">Advent Of Craft: 2025/challenges/day15 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-15T00:00:00-05:00len jaffe2025-12-14http://www.lenjaffe.com/AdventPlanet/2025/2025-12-14.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-14.html">Perl Advent: Perl Advent Calendar 2025 - The Twelve Slices Of Christmas: How Vasco Chained the Chaos </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-14/">Perl Weekly Challenge: Advent Calendar - December 14, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/14/">Raku Advent: December 14, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/14/">HTML Hell: The Wonderful World of Web Feeds - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/14/">AdventJS: AdventJS - Reto #14: Find the gift path - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p>Advent of Code: appears to be unavailable on 2025-12-14. Please try again later.</p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/14">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day14">Advent Of Craft: 2025/challenges/day14 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-14T00:00:00-05:00len jaffe2025-12-13http://www.lenjaffe.com/AdventPlanet/2025/2025-12-13.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-13.html">Perl Advent: Perl Advent Calendar 2025 - Thirty Slices, Twenty-Four Days: How Christmas Was Saved By Abandoning Estimation </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-13/">Perl Weekly Challenge: Advent Calendar - December 13, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/13/">Raku Advent: December 13, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/13/">HTML Hell: Hell is other people's markup - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/13/">AdventJS: AdventJS - Reto #13: The assembly line - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p>Advent of Code: appears to be unavailable on 2025-12-13. Please try again later.</p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/13">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day13">Advent Of Craft: 2025/challenges/day13 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-13T00:00:00-05:00len jaffe2025-12-12http://www.lenjaffe.com/AdventPlanet/2025/2025-12-12.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-12.html">Perl Advent: Perl Advent Calendar 2025 - The Night Before Deployment: How Melian Saved Christmas (and How It Can Speed Up Your App Too) </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-12/">Perl Weekly Challenge: Advent Calendar - December 12, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/12/">Raku Advent: December 12, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/12/">HTML Hell: A11y Considerations in Math on the Web - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/12/">AdventJS: AdventJS - Reto #12: Elf battle - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p><a href="http://adventofcode.com/2025/day/12">Advent of Code: Day 12 - Advent of Code 2025</a></p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/12">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day12">Advent Of Craft: 2025/challenges/day12 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-12T00:00:00-05:00len jaffe2025-12-11http://www.lenjaffe.com/AdventPlanet/2025/2025-12-11.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-11.html">Perl Advent: Perl Advent Calendar 2025 - Teaching Art to Computers the Hard Way </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-11/">Perl Weekly Challenge: Advent Calendar - December 11, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/11/">Raku Advent: December 11, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/11/">HTML Hell: How HTML changes in ePub - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/11/">AdventJS: AdventJS - Reto #11: Unwatched gifts - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p><a href="http://adventofcode.com/2025/day/11">Advent of Code: Day 11 - Advent of Code 2025</a></p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/11">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day11">Advent Of Craft: 2025/challenges/day11 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-11T00:00:00-05:00len jaffe2025-12-10http://www.lenjaffe.com/AdventPlanet/2025/2025-12-10.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-10.html">Perl Advent: Perl Advent Calendar 2025 - The Ghost of Web Frameworks Future </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-10/">Perl Weekly Challenge: Advent Calendar - December 10, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/10/">Raku Advent: December 10, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/10/">HTML Hell: a11y freedom beaver - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/10/">AdventJS: AdventJS - Reto #10: Depth of Christmas magic - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p><a href="http://adventofcode.com/2025/day/10">Advent of Code: Day 10 - Advent of Code 2025</a></p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/10">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day10">Advent Of Craft: 2025/challenges/day10 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-10T00:00:00-05:00len jaffe2025-12-09http://www.lenjaffe.com/AdventPlanet/2025/2025-12-09.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-09.html">Perl Advent: Perl Advent Calendar 2025 - Run specific tests in Perl </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-09/">Perl Weekly Challenge: Advent Calendar - December 9, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/09/">Raku Advent: December 9, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/9/">HTML Hell: Discover Dialog - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/9/">AdventJS: AdventJS - Reto #9: The reno robot aspirator - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p><a href="http://adventofcode.com/2025/day/9">Advent of Code: Day 9 - Advent of Code 2025</a></p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/09">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day09">Advent Of Craft: 2025/challenges/day09 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-09T00:00:00-05:00len jaffe2025-12-08http://www.lenjaffe.com/AdventPlanet/2025/2025-12-08.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-08.html">Perl Advent: Perl Advent Calendar 2025 - Perl who is Naughty or Nice? </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-08/">Perl Weekly Challenge: Advent Calendar - December 8, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/08/">Raku Advent: December 8, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/8/">HTML Hell: What's wrong with this HTML, and is it valid? - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/8/">AdventJS: AdventJS - Reto #8: Find the unique toy - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p><a href="http://adventofcode.com/2025/day/8">Advent of Code: Day 8 - Advent of Code 2025</a></p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/08">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day08">Advent Of Craft: 2025/challenges/day08 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-08T00:00:00-05:00len jaffe2025-12-07http://www.lenjaffe.com/AdventPlanet/2025/2025-12-07.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-07.html">Perl Advent: Perl Advent Calendar 2025 - Abstract storage of Christmas letters </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-07/">Perl Weekly Challenge: Advent Calendar - December 7, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/07/">Raku Advent: December 7, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/7/">HTML Hell: Controlling dialogs and popovers with the Invoker Commands API - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/7/">AdventJS: AdventJS - Reto #7: Decorating the tree - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p><a href="http://adventofcode.com/2025/day/7">Advent of Code: Day 7 - Advent of Code 2025</a></p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/07">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day07">Advent Of Craft: 2025/challenges/day07 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-07T00:00:00-05:00len jaffe2025-12-06http://www.lenjaffe.com/AdventPlanet/2025/2025-12-06.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-06.html">Perl Advent: Perl Advent Calendar 2025 - ToyCo want to push new toy updates </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-06/">Perl Weekly Challenge: Advent Calendar - December 6, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/06/">Raku Advent: December 6, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/6/">HTML Hell: Accessible by Design: The Role of the 'lang' Attribute - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/6/">AdventJS: AdventJS - Reto #6: Matching gloves - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p><a href="http://adventofcode.com/2025/day/6">Advent of Code: Day 6 - Advent of Code 2025</a></p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/06">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day06">Advent Of Craft: 2025/challenges/day06 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-06T00:00:00-05:00len jaffe2025-12-05http://www.lenjaffe.com/AdventPlanet/2025/2025-12-05.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-05.html">Perl Advent: Perl Advent Calendar 2025 - Santa needs to know about new toys... </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-05/">Perl Weekly Challenge: Advent Calendar - December 5, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/05/">Raku Advent: December 5, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/5/">HTML Hell: IDREFs: What they are and how to use them - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/5/">AdventJS: AdventJS - Reto #5: The countdown to take off - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p><a href="http://adventofcode.com/2025/day/5">Advent of Code: Day 5 - Advent of Code 2025</a></p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/05">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day05">Advent Of Craft: 2025/challenges/day05 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-05T00:00:00-05:00len jaffe2025-12-04http://www.lenjaffe.com/AdventPlanet/2025/2025-12-04.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-04.html">Perl Advent: Perl Advent Calendar 2025 - Stopping the Evil Grinch: A Holiday Defense Guide </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-04/">Perl Weekly Challenge: Advent Calendar - December 4, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/04/">Raku Advent: December 4, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/4/">HTML Hell: Referencing HTML elements inside Shadow DOM - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/4/">AdventJS: AdventJS - Reto #4: Decipher the Santa PIN - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p><a href="http://adventofcode.com/2025/day/4">Advent of Code: Day 4 - Advent of Code 2025</a></p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/04">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day04">Advent Of Craft: 2025/challenges/day04 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-04T00:00:00-05:00len jaffe2025-12-03http://www.lenjaffe.com/AdventPlanet/2025/2025-12-03.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-03.html">Perl Advent: Perl Advent Calendar 2025 - Santa's Secret Music Studio </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-03/">Perl Weekly Challenge: Advent Calendar - December 3, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/03/">Raku Advent: December 3, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/3/">HTML Hell: Speculation rules improvements - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/3/">AdventJS: AdventJS - Reto #3: Help the intern - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p><a href="http://adventofcode.com/2025/day/3">Advent of Code: Day 3 - Advent of Code 2025</a></p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/03">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day03">Advent Of Craft: 2025/challenges/day03 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-03T00:00:00-05:00len jaffe2025-12-02http://www.lenjaffe.com/AdventPlanet/2025/2025-12-02.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-02.html">Perl Advent: Perl Advent Calendar 2025 - All I Want for Christmas Is the Right Aspect Ratio </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-02/">Perl Weekly Challenge: Advent Calendar - December 2, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/02/">Raku Advent: December 2, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/2/">HTML Hell: Using the Ancient Evils for Debugging - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/2/">AdventJS: AdventJS - Reto #2: Manufacture the toys - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p><a href="http://adventofcode.com/2025/day/2">Advent of Code: Day 2 - Advent of Code 2025</a></p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/02">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day02">Advent Of Craft: 2025/challenges/day02 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-02T00:00:00-05:00len jaffe2025-12-01http://www.lenjaffe.com/AdventPlanet/2025/2025-12-01.html<div class='pod'><h2 id="Perl">Perl</h2>
<h3 id="Perl-Advent-Calendar">Perl Advent Calendar</h3>
<p><a href="http://perladvent.org/2025/2025-12-01.html">Perl Advent: Perl Advent Calendar 2025 - The Ghost of Perl Developer Surveys Past, Present, and Future </a></p>
<h3 id="Perl-Weekly-Challenge">Perl Weekly Challenge</h3>
<p><a href="https://theweeklychallenge.org/blog/advent-calendar-2025-12-01/">Perl Weekly Challenge: Advent Calendar - December 1, 2025</a></p>
<h3 id="Qiita-Perl-Advent-Calendar">Qiita Perl Advent Calendar</h3>
<p><a href="https://qiita.com/advent-calendar/2025/perl">Qiita Perl Advent: Perl - Qiita Advent Calendar 2025 - Qiita</a></p>
<h2 id="Raku">Raku</h2>
<h3 id="Raku-Advent-Calendar">Raku Advent Calendar</h3>
<p><a href="https://raku-advent.blog/2025/12/01/">Raku Advent: December 1, 2025 - Raku Advent Calendar</a></p>
<h2 id="HTML">HTML</h2>
<p><a href="https://www.htmhell.dev/adventcalendar/2025/1/">HTML Hell: Top layer troubles: popover vs. dialog - HTMHell</a></p>
<h2 id="CSS">CSS</h2>
<p><a href="https://cssadventcalendar.dev/">CSS Advent Calendar: CSS Advent Calendar 2025</a></p>
<h2 id="JavaScript">JavaScript</h2>
<p><a href="https://adventjs.dev/challenges/2025/1/">AdventJS: AdventJS - Reto #1: Filter the defective gifts - JavaScript, TypeScript, Python</a></p>
<h2 id="PHP">PHP</h2>
<p><a href="https://laravel.com/advent/">Laravel: Advent Calendar 2025 - Laravel - The PHP Framework For Web Artisans</a></p>
<h2 id="Java">Java</h2>
<p><a href="http://www.javaadvent.com/2025/">JVM Advent: 2025 - JVM Advent</a></p>
<h2 id="C">C#</h2>
<p><a href="https://www.csadvent.christmas/">C#: C# Advent 2025</a></p>
<h2 id="F">F#</h2>
<p><a href="https://sergeytihon.com/2025/11/03/f-advent-calendar-in-english-2025/">F# Advent: F# Advent Calendar in English 2025 - Sergey Tihon's Blog</a></p>
<h2 id="Miscellaneous">Miscellaneous</h2>
<h3 id="Performance-Calendar">Performance Calendar</h3>
<p><a href="https://calendar.perfplanet.com/2025/">Performance Planet: 2025 - Web Performance Calendar</a></p>
<h3 id="Advent-of-Code">Advent of Code</h3>
<p><a href="http://adventofcode.com/2025/day/1">Advent of Code: Day 1 - Advent of Code 2025</a></p>
<h3 id="Steam-Games-Advent-Calendar">Steam Games Advent Calendar</h3>
<p><a href="https://store.steampowered.com/app/3707810/Winter_Games_Collection__Advent_Calendar/">Steam: Save 33% on Winter Games Collection + Advent Calendar on Steam</a></p>
<h3 id="Festive-Tech-Calendar">Festive Tech Calendar</h3>
<p><a href="https://festivetechcalendar.com/">Festive Tech Calendar: Festive Tech Calendar 2025</a></p>
<h3 id="Pull-Requests">24 Pull Requests</h3>
<p><a href="https://24pullrequests.com/">24 Pull Requests: Home - 24 Pull Requests </a></p>
<h3 id="Space-Telescope-Advent-Calendar-The-Atlantic">Space Telescope Advent Calendar (The Atlantic)</h3>
<p><a href="https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/">Space Telescope Advent Calendar (The Atlantic): 2025 Space Telescope Advent Calendar - The Atlantic</a></p>
<h3 id="SANS-Holiday-Hack-Challenge">SANS Holiday Hack Challenge</h3>
<p><a href="https://www.sans.org/cyber-ranges/holiday-hack-challenge">SANS Holiday Hack Challenge 2025: Holiday Hack Cybersecurity Challenge 2025 - SANS Institute</a></p>
<h3 id="Debug-December">Debug December</h3>
<p><a href="https://www.debugdecember.com/challenges/2025/day/01">Debug December: Debug December</a></p>
<h3 id="Advent-of-Craft">Advent of Craft</h3>
<p><a href="https://www.github.com/advent-of-craft/2025/tree/main/challenges/day01">Advent Of Craft: 2025/challenges/day01 at main advent-of-craft/2025 · GitHub</a></p>
</div>2025-12-01T00:00:00-05:00len jaffe