Education
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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…
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…
Ordinary Philosophy
A blog dedicated to philosophy in the public square and the history of ideas that change the world, with accessible essa…
Organ Historical Society
A nonprofit society of pipe organ enthusiasts documenting the instrument's design, construction, and history in America.
Organic Chemistry Data
An encyclopedic collection of reference data, resources, and links for organic chemists, curated by the ACS Division of…
Organic Syntheses
A free archive of peer-reviewed, independently checked procedures for making organic compounds, a long-running reference…
Origami by Michal Kosmulski
A personal origami site with a big photo showcase of folded models, free folding instructions and diagrams, and news suc…
Origami Database
A searchable database of nearly 50,000 origami models, with publications, creators and articles to browse for folding id…
Origami.me
A guide to paper folding with free origami diagrams, step-by-step tutorials, and galleries ranging from beginner to comp…
Original Poems
A public domain poetry database you can search by poet or poem name, collecting a wide variety of poetry types in an ope…
Orpheus' Hacky Guide to Writing a Programming Language
A beginner-friendly guide written by a 17-year-old that walks you step by step through building your own programming lan…
Oryx
A military analysis blog known for its photo-documented tallies of equipment losses in the war in Ukraine, with detailed…
Osirisnet
Detailed virtual tours of ancient Egyptian tombs, with photographs, plans, and translations of their painted inscription…
Oskar Schlemmer
The estate archive of Bauhaus painter, sculptor and choreographer Oskar Schlemmer, with his life and work, the costumed…
Ostia Antica
An illustrated guide to the ancient Roman port city of Ostia, covering its buildings, mosaics, and everyday commercial l…
Our Documents
A US government site presenting 100 milestone documents of American history, from the Declaration of Independence to mod…
Our Permaculture Life
A collection of free permaculture resources from educator Morag Gamble on edible gardens, low-impact living and building…
Outside the Beltway
A long-running group blog on US politics, world affairs, and public policy, written by academics and commentators in an…
OverTheWire Wargames
Free security wargames played over SSH that teach Linux, networking, and exploitation concepts through progressively har…
Ownersman
A collection of new and old car owner's manuals from many makes that you can find and view online, handy for tracking do…
Oxford Human Rights Hub
A blog from Oxford's human rights law community with scholarly commentary on court decisions, constitutional questions,…
Oxford Machine Learning 2014-2015
Nando de Freitas's University of Oxford machine learning course page, collecting lecture videos, slides, and problem she…
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