Grammarly - Clear, effective, mistake-free writing everywhere you type.
Ask Me Anything - The official Reddit AMA app
LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.
Live-Ask - A one-stop solution for moderating discussions and Q&As.
Editsaurus - Highlights potential pitfalls in your writing to encourage good habits.
Wisdo - Learn from people who’ve been there