Education
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Online Library of Liberty
A free digital library of classic texts in history, philosophy, and political thought, curated with scholarly introducti…
Online Mathematics Textbooks
A long-running curated list of free online mathematics textbooks, from calculus and linear algebra to abstract algebra,…
Online Ruler
An on-screen ruler and protractor that shows actual size in centimeters, millimeters, and inches on any device, for quic…
Online Stopwatch
A free full-screen stopwatch and countdown timer collection built for classrooms and offices, with giant readable digits…
Online-Go
A free server for playing the ancient board game Go in the browser, with live and correspondence games, puzzles, and lea…
OnThatDay.in
Pick any date between 1947 and 2025 to see the headlines, prices, people, cinema, sport and technology of India on the d…
Ontology: Theory and History
A large reference site on ontology in philosophy, covering its history, theory and vocabulary, with sections on categori…
OpaLingo
An interactive course for learning Macedonian online, with lessons, audio pronunciation, vocabulary games, and Cyrillic…
Open Anatomy Project
A set of free, open 3D human anatomy atlases you can rotate and explore in the browser, built to give medical students e…
Open Culture
A long-running hub of free cultural and educational media: online courses, audiobooks, films, textbooks, language lesson…
Open Culture - The best free cultural & educational media on the web
An aggregator of free cultural and educational media including online courses, audiobooks, films, and eBooks.
Open Exoplanet Catalogue
An open-source database of every confirmed exoplanet, with statistics, plots, and tools for comparing planets and their…
Open Infrastructure Map
A zoomable world map built from OpenStreetMap data showing power lines, substations, pipelines, telecom cables and other…
Open Knowledge Maps
A visual search interface that turns a research topic into a bubble map of related papers and concepts, helping you get…
Open Language Archives Community
A network of digital archives cataloguing language documentation and linguistic field data contributed by researchers ar…
Open Library
An Internet Archive project building one web page for every book ever published, with millions of titles free to read or…
Open Logic Project
A collaborative, open-source logic textbook that teachers can freely customize, covering propositional and first-order l…
Open Memory Box
An online archive of private 8mm home films from the former East Germany, with hundreds of hours of everyday life in the…
Open Middle
A free library of open-ended math problems with a fixed beginning and end but many possible paths, designed to spark dee…
Open Music Theory
A free, open-source college-level music theory textbook covering everything from notation fundamentals to post-tonal ana…
Open Source Shakespeare
A searchable, free digital edition of Shakespeare's complete works, with concordance and word-frequency tools for close…
Open Syllabus
A project that maps the college curriculum across tens of millions of syllabi, letting you explore which books and texts…
Open Syllabus Galaxy
An interactive map of the million most-assigned books and articles in college courses, laid out as a glowing galaxy wher…
Open Textbook Initiative
A curated list of free open textbooks in mathematics from the American Institute of Mathematics, covering topics from ca…
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