ZenPen: An online tool for distraction-free writing.
ZenPen has a lovely layout and typography. This makes writing seem more fun and easier on the eyes. Plus, it keeps me focused on the task at hand, by removing overwhelming features such as colors and fonts. I find this helpful at staying focused.
Give it a try. I’ve found myself coming back to it a couple of times, and use it over Evernote and Google Docs sometimes for smaller writing tasks.