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.

How To Speak Canadian - A Chrome Extension for newcomers to Canada 🇨🇦

Editsaurus - Highlights potential pitfalls in your writing to encourage good habits.

Anki - Anki is a program which makes remembering things easy. Because it's a lot more efficient than traditional study methods, you can either greatly decrease your time spent studying, or greatly increase the amount you learn.