WriteBox

WriteBox is minimalistic and beautiful text editor for Chrome that works offline as well.

The add-on uses the local HTML5 storage to auto-save your work but you also have an option to sync your writing with Dropbox or Google Drive. It supports basic formatting and you can export your work as plain text or HTML files.

WriteBox offers a set of fonts to choose from and you may also switch to a dark theme in full-screen mode for a distraction-free writing environment.