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.
Microsoft 365 - Boost your productivity with reliable access anywhere with services like email, calendar, file sharing, meetings, instant messaging, and Office Online
Bit.ai - Bit is a smart real-time document collaboration platform for teams to create interactive documents, manage digital content and track document insights.
Apache OpenOffice - Apache OpenOffice is an open source, office document productivity suite.
Airborn - Create and edit documents online without sacrificing your privacy
SSuite Office - SSuite Office is called to be one of the most accomplished software developers for both beginners and professionals alike.