Education
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Refactoring.Guru
An illustrated guide to software design patterns and refactoring techniques, with cartoon diagrams and code examples in…
Refdesk
A long-running, family-friendly index of reference resources, fact checkers, dictionaries, maps and quality links across…
RefSeek
An academic search engine for students and researchers that pulls results from web pages, books, encyclopedias and journ…
Regex Learn
A free interactive course that teaches regular expressions step by step, with live exercises, a cheatsheet and a playgro…
RegexOne
Interactive lessons that teach regular expressions step by step with instant pattern-matching feedback right in the brow…
Regia Anglorum
A Dark Age and Viking-era reenactment society's site full of articles on early medieval daily life, crafts, and combat.
Reginald F. Lewis Museum
The Reginald F. Lewis Museum in Baltimore explores the history and culture of African American Marylanders through exhib…
Rejected Icelandic Female Names
A list of girls' names rejected by Iceland's official naming committee, a curious look at how a country decides which na…
Rekhta Dictionary
An online trilingual Urdu dictionary giving meanings in English and Hindi, with pronunciation, usage, synonyms, antonyms…
Related Words
A word-finding tool that returns terms related to any word or phrase, ranked by how closely they connect, handy for writ…
Relativistic Spaceship
An interactive special relativity simulator where you accelerate a spaceship toward light speed and watch time dilation,…
Relativity Park
A special relativity simulator where light crawls at walking speed, so you can see Lorentz contraction, aberration, and…
Relativity: A Modern Primer
A short and sweet textbook on Einstein's theory of relativity, taking a modern approach for readers who want the physics…
Relay
A Ludum Dare 34 game controlled with two buttons, in which you are a telegraph technician in 1914 on the eve of the firs…
Religion Compare
A reference site answering common comparative questions about belief, ritual, and practice across the world's major reli…
Reluctant Habits
A cultural forum of essays and reviews on literature, film and arts, with thoughtful takes on classics the author admire…
Reminder Days
An Encyclopedia of Greater Philadelphia entry on the Annual Reminders, the 1965-1969 pickets at Independence Hall that w…
Ren'Py
The homepage of Ren'Py, a free open-source engine used by thousands of independent visual novel and interactive fiction…
Repair and Remain
An essay on the temptation to flee difficulty in homes, marriages and careers, and the case for staying and doing the sl…
RePEc
A decentralized index of economics research that catalogs working papers, journal articles, and software code from aroun…
Replace Peer Review with Peer Replication
A scientist proposes that journals require independent replication before publication, laying out how it would work and…
Representative Poetry Online
A free University of Toronto anthology of about 4,800 poems by 700 poets across 1400 years, from Jabberwocky to sonnets,…
RepView US
A lookup tool for US House members that shows voting records and activity, searchable by ZIP code or member name, for ch…
Resource Watch
An open data platform from the World Resources Institute mapping thousands of live datasets on deforestation, climate, w…
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