Education
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Chinese Flashcards
A browser-based flashcard trainer for learning Mandarin Chinese vocabulary, with study decks you can work through at you…
Choose A License
A plain-spoken guide to picking an open source license, comparing the common choices side by side so you can decide what…
Choral Public Domain Library
A volunteer-run library of free choral sheet music scores spanning centuries of vocal repertoire, all in the public doma…
Chris Blattman
A Columbia University professor's blog on development, conflict and policy research, with candid commentary on statistic…
Chris Hecker's Website
The site of veteran designer Chris Hecker, creator of Spy Party, archiving technical talks and essays on physics, animat…
CiferTech
A hobbyist electronics blog with tutorials on Arduino, ESP32, ESP8266, ESP-NOW mesh networking, PCB design, and cybersec…
Cincinnati Art Museum
One of the oldest art museums in the US, with free admission and an online collection spanning 6,000 years, plus exhibit…
Cincinnati Children's Blog
A pediatric hospital's blog with stories, safety tips, and plain-language advice for families on children's health topic…
Cinemetrics
A database and measuring tool for film editing rhythm: thousands of movies broken down by shot length, with Barry Salt's…
Cinephilia & Beyond
An extensive resource for film lovers and filmmakers gathering screenplays, interviews, documentaries, and rare producti…
CIS 198 Rust Programming
The course site for UPenn's CIS 198 on Rust programming, with lecture slides and homework covering the language from the…
City Population
A statistical reference by Thomas Brinkhoff with population figures, maps, and charts for cities and regions in every co…
CK-12 Foundation
A nonprofit library of free K-12 textbooks, interactive simulations, and practice exercises covering math and science fo…
Clagnut Typography
A series of blog posts by Richard Rutter exploring typography, mostly from the perspective of web design and how type wo…
Clark and Miller
Free English lessons for intermediate and advanced learners, with blog posts on vocabulary, grammar and speaking more na…
Class Tech Tips
An edtech blog helping teachers and schools find new and innovative ways to use technology in the classroom, with practi…
Classic Computers NZ
A New Zealand-based museum site cataloguing vintage computers and calculators with detailed photographs and technical hi…
Clavius Moon Base
A classic debunking of moon landing hoax claims, with photo analysis and physics that explain each conspiracy argument p…
Clean Up Your Mess
A short illustrated guide to visual design for everyone, showing step by step how alignment, grouping, contrast and spac…
Cleveland Museum of Art
The Cleveland Museum of Art's website with an open access collection of tens of thousands of Creative Commons Zero artwo…
Climate Change Tracker
An open-data hub with 200+ dashboards and 1100+ charts tracking global warming, emissions, sea level and more, with nati…
Climate.us
Independent nonprofit climate science site with plain-language explainers, maps and blogs, including the ENSO blog that…
Clive James Essays
A free archive of essays by the critic and broadcaster Clive James, spanning literature, television, poetry and culture,…
Clovegarden
A sprawling non-commercial food encyclopedia covering thousands of ingredients used around the world, with photos, notes…
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