Grammarly - Clear, effective, mistake-free writing everywhere you type.
LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.
Linguix - AI-enabled writing tool for writers, editors, and businesses
TabComplete - Secure Autocomplete for Chrome
Gramlee.com - Online grammar check, proofreading and copy editing services.
Gramara - AI grammar correction with transformers