Writing prose in a world as busy as the online world can be hard. Instant messengers, busy websites and other distractions can always get into your way when all you want to do is write.
PyRoom is a free editor that stays out your way - and keeps other things out of your way, too. As a fullscreen editor without buttons, widgets, formatting options, menus and with only the minimum of required dialog windows, it doesn't have any distractions and lets you focus on writing and only writing. It is distributed under the GNU General Public Licence v3.