Grammarly - Clear, effective, mistake-free writing everywhere you type.
Workflowy - A better way to organize your mind.
Typewriter - Your on-demand editor
Dynalist - Dynalist is a web app that lets you break down and organize your thoughts in the format of lists.
Typely - A sensitive, unobtrusive and reliable tool for any writer, newspaper editor, teacher, blogger or student STA
Taleguild - Web application for short story writers and essayists