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Diffchecker
Compare text, images or PDFs and see differences.
Project Gutenberg
Over 60,000 free public domain ebooks.
Brilliant
Interactive problem-solving courses in STEM.
TypingClub
Learn touch typing with gamified lessons.
Codewars
Train coding skills by solving kata challenges.
Exercism
Practice programming with mentor feedback.
Omni Calculator
Over 3,000 calculators for everything from finance to health.
Desmos Geometry
Construct geometric diagrams interactively.
Tinkercad
Easy 3D modeling, circuits and coding in the browser.
Overleaf
Collaborative LaTeX editor in your browser.
Solar System Scope
3D interactive model of the solar system.
The Wiki Game
Race from one Wikipedia article to another using links.