Education
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Our Permaculture Life
A collection of free permaculture resources from educator Morag Gamble on edible gardens, low-impact living and building…
Our Solar System
A visual overview of our local neighborhood in the Orion arm of the Milky Way, with the Sun, planets, and their moons la…
Our World in Data
A nonprofit research platform offering free data, charts, and articles on global problems like poverty, health, and clim…
Outside the Beltway
A long-running group blog on US politics, world affairs, and public policy, written by academics and commentators in an…
Overcoming Bias
A long-running blog by economist Robin Hanson exploring cognitive bias, social signaling, and unconventional explanation…
OverTheWire Wargames
Free security wargames played over SSH that teach Linux, networking, and exploitation concepts through progressively har…
Overview of the Galaxy
A deep, well-illustrated guide to the Milky Way, from naked-eye observation to modern spectral methods, covering galaxy…
Owlet BBC BASIC Editor
An in-browser editor for BBC BASIC that runs your code on an emulated 1980s BBC Micro, perfect for tiny tweet-sized prog…
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 Economics Resource Hub
Free reports and charts from a leading forecasting firm covering global growth, trade tensions, and industry-specific ec…
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…
Oyez
A free archive of U.S. Supreme Court cases with summaries, oral argument audio, and justice profiles that make the Court…
P2PU
A grassroots peer learning community running free learning circles in libraries and community spaces worldwide, built ar…
p5.js
A free, open-source JavaScript library for learning to code and making interactive art and visuals in the browser.
p5.js
A friendly creative-coding library and community for learning to code and make art, with a gallery of runnable examples,…
Pacelock
A free Pomodoro timer built around named work blocks, flexible breaks and a distraction-capture box, designed around ADH…
Packet.School
A game-like way to learn networking, with interactive simulations, drag-and-drop network building, and a terminal experi…
Pagan Places
An atlas of sacred sites of Europe's indigenous religions, from ancient stone circles and holy groves to modern temples,…
Pagat
An authoritative encyclopedia of card game rules from around the world, documenting hundreds of traditional and regional…
Paintable
A digital painting site with free tips, tutorials and resources for learning to paint on a computer, with new lessons po…
Painters on Paintings
An online journal where contemporary painters each write a short personal essay about a single painting they love, with…
Painting Class with David Dunlop
A blog from the Emmy-winning PBS painting instructor, sharing lessons on luminous landscapes drawn from old master techn…
Painting Demos
A collection of painting demonstrations meant to inspire your own work, showing how artists build a piece from blank can…
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