Grammarly - Clear, effective, mistake-free writing everywhere you type.
GradeProof - Proofreading with Artificial Intelligence
Typewriter - Your on-demand editor
Nurtz - Proofreading concierge in your Slack
Typely - A sensitive, unobtrusive and reliable tool for any writer, newspaper editor, teacher, blogger or student STA
Proofree - Free proof-reading by humans.