Grammarly - Clear, effective, mistake-free writing everywhere you type.
Andy Chatbot - Learn and practice English with exercises, grammar and games
ProWritingAid - For the smarter writer. A grammar checker, style editor, and writing mentor in one package.
English AI - Practice conversation in English with AI
Gramara - AI grammar correction with transformers
Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.