Firepad - Open source collaborative code and text editing that relies on Firebase for real-time data...
Apple iWork - iWork is an office suite by Apple.
CryptPad - CryptPad is a collaborative office suite that is end-to-end encrypted and open-source.
Airborn - Create and edit documents online without sacrificing your privacy
eduPad - Real-time collaborative text-editor. No account required. Edits highlighted in authors color.
Bit.ai - Bit is a smart real-time document collaboration platform for teams to create interactive documents, manage digital content and track document insights.