Education
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Chalkdust Magazine
A free online magazine written by mathematicians for anyone curious about maths, featuring puzzle columns, crosswords, a…
Chaos Matrix
A long-running archive of chaos magick texts, occult humor and digital books, immanentizing the eschaton online since 19…
Character Amnesia in China
Explores why many literate Chinese speakers now struggle to hand-write characters they can read, thanks to phones and ty…
Character Design References
A visual library for character designers and animation artists, collecting model sheets, tutorials, and artwork from fil…
Character Lab
A nonprofit translating psychological research on character strengths like grit and curiosity into practical playbooks f…
Charles Booth's London Poverty Maps
An interactive digitization of Charles Booth's 1890s survey mapping London street by street by wealth and poverty, overl…
Charles Dickens Character Name Generator
A generator that mixes first and last names from Charles Dickens characters into new Dickensian names, handy for fiction…
Charlie Chaplin Archive
Charlie Chaplin's own professional and personal archive online: thousands of set photographs, posters, screenplays, lett…
Chartle
A daily data puzzle: study a chart where one country's line is highlighted in red and guess which country it is, using t…
Cheatography
A library of free cheat sheets for programming, software, and everyday topics, where anyone can find, download, or creat…
Checkerboard Programming
A puzzle game where you write short snippets of code to color the squares of a checkerboard until they match each target…
CheckiO
A browser-based coding game where you solve programming challenges, progress through missions, and learn from other play…
Checkmate Champ
A chess tactics trainer that serves up positions to solve so you can sharpen pattern recognition, one forced win at a ti…
Cheese.com
A searchable encyclopedia of world cheeses, with details on origin, milk type, texture, and flavor for nearly 2,000 vari…
ChefSteps
A cooking-technique site from a Seattle culinary team, teaching sous vide, baking, and modernist methods through free cl…
Chemguide
Jim Clark's plainspoken guide to A-level chemistry, trusted by generations of students for its patient explanations of m…
ChemSpeller
Spells any word you type using symbols from the periodic table of elements, a quick toy for chemistry fans and word love…
Cherokee Nation Language Program
The Cherokee Nation's official language resource, offering lessons, a syllabary guide, and tools for learning the Cherok…
Chess Programming Wiki
A reference wiki dedicated to the algorithms, engines, and history behind computer chess programming, maintained by the…
Chess Stack Exchange
A question-and-answer community for chess players and enthusiasts, covering opening theory, tactics, rules, and chess va…
Chess Tempo
A chess training site with a huge database of tactics puzzles, endgame drills, and games, usable free without an account…
chess24
A chess news and broadcast site offering free tournament coverage, analysis, and lessons alongside its competitive onlin…
ChessBase
A long-running chess news and database site covering tournament coverage, opening theory, and analysis for players and c…
ChessBlunders
A chess training site that runs your games through Stockfish 16 to find your blunders, then turns them into puzzles you…
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