Grammarly - Clear, effective, mistake-free writing everywhere you type.
Wordtune - AI-powered writing companion
LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.
Grammarian PRO3 - Grammarian PRO3 is a feature-rich grammar checker that enables you to write better content without taking assistance from the English teacher.
Anyword - An AI platform for creating effective marketing copy, trained on tens of millions of successful ads.
Editsaurus - Highlights potential pitfalls in your writing to encourage good habits.