Penflip - Typewrite is a real-time collaborative writing environment with Markdown support, versioning and Dropbox syncing. Alternatives to Penflip for Web, Windows, Mac, Linux, iPhone and more.
WriteXO - A cloud based notepad made for writers by writers.
Cleartext - A text editor that allows only the 1,000 most common words
notepad.pw - notepad.pw is a online notepad which allows you to save your text in the cloud with features like
Quill - Powerful, API-driven rich text editor
aNotepad - anotepad.com is an online text editor that you can write notes and anotepad also has great stability