Emacs editing from within Chrome, especially Chromebooks. Works offline. Based on ymacs.
http://www.ymacs.org/ extended to work as a chrome app, giving access to local files and all keystrokes (C-n, C-w, and C-t). On chromebooks, local files even includes Google Drive.
Still in early development, but self hosted development works. Soon to come: more traditional file name handling support, then dired and M-x grep
A Hackathon project by Pace Willisson <firstname.lastname@example.org> and Eric Willisson <email@example.com>