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.

Celtx - Celtx is a scriptwriting software platform with applications in a wide range of mediums but that specializes in helping screenwriters.

Write Together - Learn to write, together, one day at a time.

Scrivener - Scrivener is a content-generation tool for composing and structuring documents.