4thewords - Write more, have fun. We’re a writing software that blends productivity and game mechanics so you can defeat writer's block and build a consistent writing habit! (We’re like a gym, built by writers, for writers)

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

Write or Die - Write or Die is an application for Windows, Mac and Linux which aims to eliminate writer's...

Grammarly - Clear, effective, mistake-free writing everywhere you type.

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Slick Write - Slick Write checks your writing's grammar and style for free!