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.

Dabble Writer - Writing software for novelists.

Airborn - Create and edit documents online without sacrificing your privacy

Novlr - Online word processor and organizer for novel writing.

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

SHAXPIR - A modern cloud workspace for fiction writing & worldbuilding