Grammarly - Clear, effective, mistake-free writing everywhere you type.

Linguix - AI-enabled writing tool for writers, editors, and businesses

ProWritingAid - For the smarter writer. A grammar checker, style editor, and writing mentor in one package.

LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.

Gramara - AI grammar correction with transformers

GPT-J - Open-source cousin of GPT-3, everyone can use it