Google Docs - Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.

Manuskript - Open-source tool for writers.

Apple iWork - iWork is an office suite by Apple.

BlankPage - Stay motivated to write, and finish your story

Bit.ai - Bit is a smart real-time document collaboration platform for teams to create interactive documents, manage digital content and track document insights.

Novelize - Novelize is an online novel writing app designed to keep authors on track.