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Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.
CS183B - Startup Class - Stanford class taught by Sam Altman & guest speakers
Memrise - Learn a new language with games, humorous chatbots and over 30,000 native speaker videos.
How to Acquire More Users - The growth guide used by Y Combinator companies
Busuu - Join the global language learning community, take language courses to practice reading, writing, listening and speaking and learn a new language. Learn English with busuu's .
Velocity.js - Velocity is a JavaScipt animation engine.