Education
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Octave Compass
An interactive compass of the twelve notes: pick a scale or mode and see its shape on the wheel, hear it, and explore ev…
Oculi Mundi
An online home for the Sunderland Collection of antique maps of the earth and skies, with explorable galleries, stories,…
OEC Tradle
A daily guessing game where you identify a country from its export profile, a fun way to learn about global trade patter…
OECD Better Life Index
An interactive flower-shaped chart that lets you weigh and compare countries across eleven wellbeing dimensions like inc…
OECD Data
Interactive charts and comparative tables covering economic indicators, wages, education, and wellbeing across OECD memb…
OECD iLibrary
The OECD's digital library of books, papers, and statistics on economics, education, and social policy, with many chapte…
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 for National Statistics
The United Kingdom's official statistics agency, publishing interactive visualizations on inflation, employment, migrati…
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 My Git!
An open source card game that teaches Git by showing a live picture of a repository, turning commits, branches and merge…
OH! MATSURi
A searchable calendar of traditional Japanese festivals for visitors, with dates, locations, photos and a MATSURiPedia o…
OKAI
An interactive introduction to artificial intelligence from Brown University that uses graphics to explain core AI conce…
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…
Old Radio World
A large archive of the most popular old time radio shows from the 1930s, 1940s, and 1950s that you can stream or downloa…
Old Tokyo
A collection of vintage photographs and postcards of prewar Tokyo, from Ginza and Nihonbashi to Wright's Imperial Hotel…
oldurbanist.blogspot.com
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Old Urbanist
A blog examining pre-automobile town planning and traditional urban form, arguing older neighborhood patterns hold lesso…
OldMapsOnline
A search portal indexing hundreds of thousands of historical maps from libraries worldwide, browsable by place and time…
OldNYC
A map interface for exploring 40,000 historical photographs of New York City street corners from the New York Public Lib…
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