Apple iWork - iWork is an office suite by Apple.

Mellel - Home Page for Mellel: The word processor of choice for scholars, writers and long document writing. for Mac OS X and iOS.

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.

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

Airborn - Create and edit documents online without sacrificing your privacy

Collabora Office - Collabora Productivity, of course with CollaboraOnline, offers the most powerful Cloud, Mobile and Desktop Enterprise Office Suite. Cross-device and fully Open Source.