Grammarly - Clear, effective, mistake-free writing everywhere you type.
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.
Cognifyd - The smart editor that helps you write business content
Writefull - Writefull provides you with the tools you need to improve the quality and consistency of your writing.
Kibin - Professional Proofreading as a Service
Typely - A sensitive, unobtrusive and reliable tool for any writer, newspaper editor, teacher, blogger or student STA