Education
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OAPEN Library
A quality-controlled library of open access academic books you can read and download free, covering the humanities and s…
Obelisk Art History
An independent online art history publication telling the story of art from cave paintings to contemporary movements thr…
Observations on Film Art
The long-running blog of film scholars David Bordwell and Kristin Thompson, offering deep, readable essays on film histo…
Ocean Census
A global scientific mission documenting new marine species, sharing discoveries, expedition stories, and species profile…
Oculi Mundi
An online home for the Sunderland Collection of antique maps of the earth and skies, with explorable galleries, stories,…
OEIS
The On-Line Encyclopedia of Integer Sequences, a searchable database of more than 360,000 number sequences used by mathe…
Of Dollars and Data
Nick Maggiulli writes data-driven essays on personal finance and wealth-building, using charts and statistics rather tha…
Of Particular Significance
A physicist's blog explaining particle physics, the Large Hadron Collider, and other big ideas in science for curious re…
Off World Backup
A tongue-in-cheek pitch for saving your files off-world before the apocalypse, paired with a clear explainer of how data…
Offbeat France
A blog exploring French curiosities, oddities, mysteries and legends, mixing travel with history to explain why France i…
Office of the Historian
The US State Department's history office, publishing declassified diplomatic documents and historical essays on American…
OGLdev
A collection of modern OpenGL tutorials by Etay Meiri that walk through rendering, lighting, and shaders step by step, w…
OH! MATSURi
A searchable calendar of traditional Japanese festivals for visitors, with dates, locations, photos and a MATSURiPedia o…
Old Bailey Online
A searchable digitized archive of nearly 200,000 criminal trials held at London's Old Bailey court between 1674 and 1913…
Old Line Plate
An independent research project on the foodways and cooking traditions of Maryland, with historical recipes and food-his…
OldMapsOnline
A search portal indexing hundreds of thousands of historical maps from libraries worldwide, browsable by place and time…
Olivier Cleynen
Olivier Cleynen's free lecture notes and books on fluid mechanics and thermodynamics, with clear illustrations, along wi…
Omni Calculator
A collection of more than 3,000 free calculators built with subject experts, covering everything from mortgage payments…
Omniglot
Simon Ager's online encyclopedia of writing systems and languages, documenting scripts and alphabets from around the wor…
On Biology
BMC's blog of insight and opinion on the latest biology research and developments, with short pieces that translate new…
On History
A digital magazine from the Institute of Historical Research, the UK national centre for the study of history, publishin…
OneLook
A dictionary metasearch that queries dozens of dictionaries at once and includes a powerful reverse dictionary and thesa…
Online Ethics Center
A repository of case studies, articles, and teaching resources on ethics in engineering, science, and research for a gen…
Online Etymology Dictionary
A searchable dictionary that traces the origins and historical development of English words.
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