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LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.
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.
Grammarly - Clear, effective, mistake-free writing everywhere you type.
Andy Chatbot - Learn and practice English with exercises, grammar and games
Gramlee.com - Online grammar check, proofreading and copy editing services.
English For Tech - The first modern English textbook for people in tech.