Education
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Lean Game Server
A home for interactive Lean games, including the Natural Number Game, where you learn to prove theorems by solving level…
Learn GDScript From Zero
A free browser-based app that teaches you to code from scratch with Godot's GDScript through interactive lessons and exe…
Learn Git Branching
An interactive visualization tool that teaches git commands and branching concepts through animated sandbox levels and c…
Learn Morse Code
An interactive web app that teaches Morse code with a virtual signal device, free and ad-free, for learning the dots and…
Learn Morse Code
A Google experiment that teaches the whole Morse alphabet in about 15 minutes using memorable picture mnemonics and quic…
Learn Python
A free interactive Python tutorial with lessons you work through right in the browser, running code in an embedded edito…
Learn Shell
A free interactive Shell tutorial that teaches shell scripting through short lessons and exercises you can run in the br…
Learn to Play Go
A friendly interactive course that teaches the board game Go in five short lessons, with clickable boards for capturing,…
Learn.Genetics
The University of Utah's genetics education site, home of the famous interactive Cell Size and Scale zoom from coffee be…
LearnAnatomy3D
A free 3D human anatomy atlas with male and female models you can peel layer by layer from skin to skeleton, covering 11…
Learning Music (Ableton)
Ableton's interactive, browser-based lessons that teach the fundamentals of music production with no equipment needed.
Learning Synths
Ableton's interactive guide to synthesizers, with a synth you can play in the browser while learning what each part does…
Legacy Survey Sky Browser
Pan and zoom across a giant stitched image of the night sky from the DESI Legacy Imaging Surveys, with millions of galax…
Legacy Survey Sky Browser
A zoomable sky atlas from the Legacy Surveys that lets you pan across deep telescope imagery of the night sky and the ga…
Legex
A replay visualization of United States legislation, showing bills as they are proposed, passed, and signed into law acr…
Let's Learn About Waveforms
An illustrated interactive primer on waveforms that explains the shapes behind sound, with live visuals you can tweak as…
Let's Remove Quaternions from Every 3D Engine
An interactive introduction to rotors from geometric algebra, with live 3D diagrams that explain rotation more clearly t…
Lettervoxd
Surfaces one-in-a-billion words used in film dialogue, mining movie subtitles for the rarest vocabulary so you can see w…
Lexi Explorer
A free language-learning site with interactive vocabulary tools, sentence practice, pronunciation audio, and mini-games,…
Lexicoff
A free multilingual dictionary powered by Wiktionary, with definitions, examples, pronunciations, and inflected forms th…
Libby Multi-Library Search
A search tool that checks several libraries at once for a book's availability on Libby, saving you from hopping between…
Library of Babel
A digital take on Borges' story that holds every possible page of 3,200 characters, letting you browse or search for any…
Library of Time
Shows the current date in dozens of calendars from around the world and across history, with a map view, a customizable…
Library Storytime
Enter a US city or ZIP code to see free kids' events like storytimes, crafts, and STEM sessions pulled from live calenda…
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