Education
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Cubing.net
A home for speedcubing web tools, best known for an algorithm viewer that animates move sequences on a virtual cube so y…
Cultural Atlas
A guide to the world's cultures covering communication styles, naming conventions, social etiquette and business norms,…
Cultural Atlas
A guide to the world's cultures covering communication styles, naming conventions, etiquette, religion and family life,…
Cumulonimbus Mammatus - Names of Clouds
A photo-led guide to mammatus clouds, the pouch-like bulges hanging under storm anvils, part of a site that names and ex…
Curlie
A volunteer-edited directory of the web, the successor to DMOZ, sorting sites by topic and region into categories for br…
Current Archaeology
The website of Britain's longest-running archaeology magazine, covering excavations, museum finds, and archaeological te…
Current World Archaeology
A magazine site covering archaeological digs, discoveries, and heritage sites across every continent, from Bronze Age Eu…
Curt Bloch: Het Onderwater-Cabaret
Leaf through the 95 handmade magazines of satirical poems Curt Bloch made while hiding from the Nazis in the Netherlands…
Custom Skill Tree Maker
A small tool for designing RPG-style skill trees with dependencies between skills, exportable as an image to map a cours…
Cut the Knot
Alexander Bogomolny's encyclopedic collection of interactive math miscellany, with hundreds of proofs, puzzles, and curi…
CyberSeek
Interactive career pathway and heat map tools built on US job-market data, showing where cybersecurity roles are concent…
Cycle Archive
A free digital library of vintage cycling publications from the 1860s to the 1920s, with scanned magazines and books fro…
Cyclocane
An aggregator tracking every active tropical cyclone worldwide on one map, pulling forecasts from multiple national weat…
Cyclostationary Signal Processing
An expert's long-running tutorial blog on the statistics of communication signals, with worked explanations, datasets, p…
Cyndi's List
A meticulously organized directory of genealogy websites and resources, covering hundreds of categories for family histo…
d.school Public Library
Stanford d.school's digital libraries of design thinking: browse the Library of Ambiguity, a Design Questions Library an…
D3 Graph Theory
Interactive, visual tutorials that teach graph theory by letting you drag nodes, build graphs and play around with conce…
Daily Chess Musings
A chess blog from a scholastic coach in the San Francisco Bay Area, welcoming people who want to learn the game with les…
Daily Nous
A news and discussion site for the philosophy profession, covering academic debates, new research, and the philosophical…
Daily Philosophy
An accessible online philosophy magazine with essays, book reviews and interviews applying classic and modern thinkers t…
Daily Science Fiction
A magazine that publishes one free science fiction or fantasy short story every weekday, building a huge archive of quic…
Daily Stoic
A site built around Ryan Holiday's daily meditations that translates ancient Stoic philosophy into practical guidance fo…
Dalloul Art Foundation
A Beirut art foundation's free online collection and open registry of modern and contemporary Arab artists, with artwork…
Damn Interesting
Long-form, meticulously researched true stories of obscure history and science, published ad-free since 2005 with accomp…
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