Grammarly - Clear, effective, mistake-free writing everywhere you type.
Typely - A sensitive, unobtrusive and reliable tool for any writer, newspaper editor, teacher, blogger or student STA
LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.
editorr - Get instant writing help from real editors.
ProWritingAid - For the smarter writer. A grammar checker, style editor, and writing mentor in one package.
Scrivener - Scrivener is a content-generation tool for composing and structuring documents.