LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.
Paraphrasingtool.site - The paraphrasing tool is the best sentence tool available online free for writers, the tool help users to avoid plagiarism and write unique articles in no time.
Grammarly - Clear, effective, mistake-free writing everywhere you type.
Lightkey Predictive Typing for Windows - Boost your efficiency by 40% in Office, Gmail, WhatsApp Web
WhiteSmoke - WhiteSmoke software products for writing and language. WhiteSmoke is a grammar checker, spell checker, style checker and more - in a single package. Also featuring translation software and English video courses.
Grammatica - AI powered writing assistant