Education
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International Mathematical Olympiad
The official archive of the world's premier high-school math competition, with every past year's problems and results fr…
International Phonetic Alphabet Guide
An interactive IPA chart where clicking any symbol plays an audio recording, making the phonetic alphabet easy to explor…
International Sign Dictionary
An online dictionary of International Sign with video entries, searchable by word, for learners and interpreters working…
International Slide Rule Museum
The world's largest free digital repository of slide rules and math artifacts, with thousands of images, manuals and gal…
International Spy Museum
A Washington museum devoted to the history of espionage, with online stories about real spies, codes, and covert operati…
Internet 1996 World Exposition
A preserved worlds fair for the information age from 1996, with pavilions, exhibits and a book about the event, a time c…
Internet Archive: Digital Library of Free & Borrowable Texts, Movies, Music & Wa…
Nonprofit digital library offering free access to texts, films, music, software, and the Wayback Machine.
Internet Encyclopedia of Philosophy
A peer-reviewed philosophy reference with thousands of in-depth articles on thinkers and ideas, written and edited by ph…
Internet Glossary of Nuclear Terminology
An alphabetical glossary of nuclear terms from atomic energy and background radiation to meltdown, fallout and spent fue…
Internet in a Box
A project that packs Wikipedia, Khan Academy, maps and thousands of books into a small offline server so schools and cli…
Internet Sacred Text Archive
A quietly vast archive of freely readable texts on religion, mythology, folklore, and the esoteric, online since 1999.
Interrupt
A community blog for embedded software makers with in-depth articles on firmware, microcontrollers, debugging, and tooli…
Intersection of Three Circles
Relaxing interactive geometry based on a Numberphile video. Use the mouse to move circles and watch how their intersecti…
Interslavic
The home of Interslavic, a modern constructed language designed to be understood by speakers of any Slavic language with…
Interval Signals Online
An online collection of interval signals and station IDs from radio broadcasters around the world, the short tunes stati…
IntervalKit
Explore scales, modes and chords on guitar, piano, cello or recorder, with notes on how each mode sounds and how its cho…
Interview with Gwern
A long conversation with the pseudonymous writer Gwern on his research habits, living cheaply, anonymity and legacy, and…
In-The-Sky.org
Dominic Ford's astronomy guide with night-sky charts, a live virtual planetarium, and calendars of upcoming celestial ev…
Introduction of Photography in Iran
A Smithsonian essay on how photography arrived at the Qajar court in Iran, illustrated with glass plate negatives by Ant…
Introduction to Computer Music
A free online textbook from Indiana University covering acoustics, synthesis, MIDI, digital audio and algorithmic compos…
Introduction to Distributed System Design
A classic tutorial from Google Code University explaining the core ideas behind designing distributed systems, preserved…
Introduction to Modern Statistics
A free online textbook that teaches statistics and data analysis from scratch, with worked examples, real datasets, exer…
Introduction to Stochastic Calculus
A beginner-friendly walkthrough of stochastic calculus that builds intuition for random processes through ordinary calcu…
Introduction to System Programming and C
A 2014 online course on system programming and C from the University of Illinois, with numbered lessons and an in-browse…
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