Education
5,614 pages · most loved first · page 175 of 234· Tonble one of these
Space Time
A 3D universe explorer in your browser where you fly among the planets, stand on other worlds, watch eclipses, and see w…
Spaced Repetition Can Allow for Infinite Recall
A walkthrough of how spaced repetition schedules reviews to defeat forgetting, with a simple model of memory decay and w…
Spaced Repetition Systems Have Gotten Way Better
An explainer on how the FSRS algorithm improved flashcard scheduling over older spaced repetition systems, and what that…
Spacehack
A directory of ways ordinary people can take part in space exploration, from classifying galaxies and black holes to map…
spaceprob.es
A catalog of the active human-made machines scattered across our solar system, with their distance, launch and mission d…
Spain Lives in Flats
An interactive scrollytelling map from El Diario traces how Spanish cities grew upward, using cadastre data to show the…
SpanishDict
A popular English-Spanish dictionary and translator with over a million words and phrases, plus conjugations and learnin…
SparkFun Tutorials
Free step-by-step electronics tutorials from a beloved open-hardware retailer, covering soldering, sensors, and beginner…
Speak & Spell JS
A browser emulator of the 1978 Texas Instruments Speak & Spell with authentic recorded sound, faithful to the original t…
Speak Pashto
A practical online guide to learning Pashto, the language spoken in Pakistan's Khyber Pakhtunkhwa region, written for En…
Speaking of Geoscience
The official blog of the Geological Society of America, with posts from geoscientists on research, field work, and Earth…
Speaking.io
A concise, practical guide to public speaking, with tips on preparing talks, designing slides, and delivering them with…
Specialized Signs
A specialized American Sign Language dictionary from Austin Community College Interpreter Services, covering technical a…
Species of the River
An immersive British Museum online exhibition about the Yaqui (Yoeme) people of the Sonora desert, guiding you along the…
Spectacles in the Roman World
A free open textbook collecting ancient writings on Roman spectacles - gladiators, chariot races, theatres and beast hun…
Spectral Codex
Photo essays, road trips and a geospatial atlas of temples, ruins and odd places across Taiwan and East Asia, organised…
Speech Accent Archive
A research database of the same English paragraph read aloud by speakers of hundreds of native languages, letting you co…
Speechling Tools
A collection of free tools for learning a new language, free forever with no login required, from the Speechling languag…
Speed Solve
A browser math whiteboard called Speed Solve that works out problems such as simplifying fractions, derivatives and syst…
SpeedCoder
A free typing tutor where you practice touch typing on real code snippets in C, JavaScript, Python and more, with lesson…
SpeedCubeDB
A free speedcubing database of algorithms and solve reconstructions for every puzzle from 2x2 to 6x6, Square-1, Pyraminx…
SpeedNotes
A free web app that trains you to read faster by flashing text in one spot so your eyes never have to move, promising up…
SpeedRead
A minimal, distraction-free speed reading tool that flashes words one at a time so you can practice reading at 900 words…
Speedsums
How many sums can you do in 30 seconds? A minimalist mental arithmetic sprint that throws quick additions, subtractions…
Tonble from any page
The extension puts 👍 · Tonble · 👎 in a slim bar on every site you visit, so the next find is always one click away.
Add to Browser — it's freeWorks in Chrome, Edge and Brave. No account needed.