Grammarly - Clear, effective, mistake-free writing everywhere you type.
Final Draft - Use your creative energy to focus on the content; let Final Draft take care of the style.
editorr - Get instant writing help from real editors.
Trelby - The free, multiplatform, feature-rich screenwriting program!
Typely - A sensitive, unobtrusive and reliable tool for any writer, newspaper editor, teacher, blogger or student STA
Celtx - Celtx is a scriptwriting software platform with applications in a wide range of mediums but that specializes in helping screenwriters.