Writebox - Writebox is a simple and distraction-free text editor for Chrome and iPhone/iPad.
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.
Calmly Writer - Distraction-free text editor for Mac, Windows, Linux and ChromeOS.
Microsoft Word - Microsoft Word is a commercial word document processor for Windows.
Stashany - Online notepad for developers
Apache OpenOffice Writer - Open-source word processor of the Apache OpenOffice suite.