Celtx VS Writefull

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

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.

LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.

yWriter - Free writing software designed by the author of the Hal Spacejock and Hal Junior series. yWriter6 helps you write a book by organising chapters, scenes, characters and locations in an easy-to-use interface.

Editsaurus - Highlights potential pitfalls in your writing to encourage good habits.