PiratePad - Real-time collaborative text-editor. No account required. Edits highlighted in authors color.
Microsoft Word - Microsoft Word is a commercial word document processor for Windows.
Etherpad - Etherpad is a highly customizable Open Source online editor providing collaborative editing in...
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.
Firepad - Open source collaborative code and text editing that relies on Firebase for real-time data...
AbiWord - AbiWord is a free software word processor.