If you have to write, code, or you just want to compose a letter or e-mail without being distracted, PenZen offers the ultimate in distraction-free writing environments. Simply visit the site, maximise your browser, remove those pesky toolbars, and get to work.
If a flashing IM window in the background or a constantly updating Twitter stream or the lure of your e-mail client peeking out from behind your browser is too much to bear, PenZen can help. There are two buttons at PenZen: one to save your file to Pen.io, and another to save your document to a PDF. Other than that, it's a completely white screen.
Once you've maximized your browser window, press F11 (Chrome and Firefox) to go into full-screen mode. Now, assuming you're working entirely in one display, you have the perfect writing environment that's completely distraction-free.
It may not have customisation options to change the colour of the text or the background, or the soft green text on black background that was popular in our Five Best Distraction Free Writing Tools roundup, but it's a great alternative if you want something Web-based that's even simpler to use.