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Grammarly - Clear, effective, mistake-free writing everywhere you type.
Gramara - AI grammar correction with transformers
Expresso - The award-winning Expresso editor is equally suitable as a teaching tool for the beginning user of regular expressions or as a full-featured development environment for the experienced programmer with an extensive knowledge of regular expressions.
Perfect Tense - AI-powered grammar checker with an API
Hemingway - Hemingway App makes your writing bold and clear.
Andy Chatbot - Learn and practice English with exercises, grammar and games