Education
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Open Yale Courses
Free and open access to a selection of introductory Yale University courses, with full lecture videos, syllabi, and tran…
Open.gl
An extensive, beginner-friendly guide to modern OpenGL for game development on all major platforms, taking you from a bl…
Open5e
A clean, fast reference for the Dungeons and Dragons 5th Edition open rules, with searchable monsters, spells, and class…
OpenCanada
A publication of Canada's international affairs institutes that explains and analyzes Canada's place in the world throug…
opendata.swiss
Switzerland's national open data portal, aggregating public datasets from federal, cantonal, and municipal authorities a…
openDAW Studio
A free, open-source music studio that runs in the browser, letting you record, sequence and mix tracks with synths and e…
OpenFactBook
A community-maintained successor to the CIA World Factbook with free data on 260+ countries covering geography, people,…
OpenGL 4 Shaders
A short, clear introduction to OpenGL shaders from Anton's OpenGL 4 tutorials, covering vertex and fragment shaders and…
OpenGL Tutorial
Free step-by-step tutorials for modern OpenGL 3.3 and later in C and C++, from the first triangle to lighting, textures…
OpenGLBook
A free OpenGL programming tutorial in online book format, walking through the fundamentals of graphics programming one c…
OpenHistoricalMap
An interactive map of the world throughout history, built by volunteers and dedicated to the public domain, so you can s…
OpeningTree
A chess tool that builds an opening tree from your Lichess or Chess.com games, grandmaster databases, or custom PGN for…
OpenLearn
The Open University's free learning platform with nearly a thousand self-paced courses across science, history, language…
Open-Source Psychometrics Project
A free, ad-light collection of psychological tests and quizzes built on open research methods, letting curious visitors…
Opensource.com
A community publication with articles, tutorials, and stories about open source software, hardware, and culture from dev…
OpenStax
A Rice University nonprofit publishing free, peer-reviewed, openly licensed textbooks for college and high-school subjec…
OpenStax
Free peer-reviewed college textbooks in math, science, social sciences and humanities, readable online and downloadable…
OpenStreetMap
The free, volunteer-built map of the world: zoom anywhere to see streets, paths and buildings mapped by locals, get dire…
Openverse
A search engine for openly licensed and public-domain images and audio, aggregating hundreds of millions of freely reusa…
OpenVim
An interactive tutorial that teaches the Vim text editor right in the browser, guiding you key by key with a virtual key…
Ops-Class
Hack the kernel: a free online operating systems course from SUNY Buffalo with videos and assignments where students com…
Oral History Association
The professional home for oral historians, with guides on interviewing techniques and links to major oral history projec…
ORBAT Mapper
A browser tool for building order-of-battle maps, placing military units on a map and animating their movements to recre…
ORBIS
Stanford's geospatial model of the Roman world that calculates the time and cost of travel between ancient cities by roa…
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