Education
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Clean Up Your Mess
A short illustrated guide to visual design for everyone, showing step by step how alignment, grouping, contrast and spac…
Clear Dark Sky
Star-gazing weather forecasts in clear-sky chart form, showing hour-by-hour cloud cover, transparency, and seeing for th…
Clearer Thinking
A nonprofit offering dozens of free interactive tools, quizzes, and mini-courses for improving decision-making, habits,…
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…
CleverMind Teasers
Interactive visualizations of probability puzzles like the 100 Prisoners Problem, with simulations you can run and tweak…
Climate Change Evidence
NASA lays out the evidence for rapid climate change - ice cores, rising seas, shrinking ice sheets, warming oceans - wit…
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…
Clio Infra
A collaborative database of long-run historical statistics on income, education, and health, letting researchers chart g…
Clive James Essays
A free archive of essays by the critic and broadcaster Clive James, spanning literature, television, poetry and culture,…
ClojureScript Koans
A browser-based set of koans that teach ClojureScript through failing tests you fix one by one, nudging you along a path…
Closer to Van Eyck
A high-resolution viewer for the Ghent Altarpiece and other works by Jan Van Eyck that lets you inspect the painting dow…
Cloud TTS
A free text-to-speech tool where you paste text and hear it read in a natural voice, with 140 languages and karaoke-styl…
Clovegarden
A sprawling non-commercial food encyclopedia covering thousands of ingredients used around the world, with photos, notes…
Clyfford Still Museum
A Denver museum devoted entirely to Clyfford Still, the abstract expressionist who kept most of his work out of public v…
CMD Challenge
Solve one-line shell challenges in a built-in terminal, from basic file tricks to advanced pipelines, with instant feedb…
CMSI 2120: Data Structures
Course notes and lecture material for a university data structures class, offering a lightweight, readable introduction…
CMU 15-721 Database Systems
The Spring 2016 course page for Carnegie Mellon's advanced database systems class, with the schedule, readings, and slid…
CO2 Levels
An interactive graph of atmospheric carbon dioxide and global temperature, letting you zoom from the recent Mauna Loa re…
Coaching Soccer Weekly
A podcast and resource site sharing training sessions, coach interviews, and commentary from world class soccer coaches,…
Coast FIRE Calculator
A free Coast FIRE calculator that works out how much you need invested today to compound to financial independence with…
Cobble
A daily word game: come up with two words that together use up all of today's letters, with a fresh set of letters each…
Cocaine & Rhinestones
Tyler Mahan Coe's deeply researched podcast on the history of 20th century country music, telling the wild stories behin…
Cochineal: Mexico's Red
An online exhibit from Harvard Museums of Science and Culture on cochineal, the insect-made red dye of Mexico, tracing i…
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