cloud9 is the software behind Cloud9ide.com - an IDE that runs entirely in the browser and is programmed in JavaScript based on Node.js. An interesting project, the current version also offers an offline mode, so you can easily work on projects on your server via the browser and then continue working locally in the offline case (on the train or in WLAN-sparse hotels in Swabia) and later resynchronize. I myself am IDE-incompatible, but programming in the browser has fascinated me for many years, simply because you can access your projects from anywhere, even without having your own computer with you. If I ever want to take a closer look, someone has written an installation guide for Ubuntu. Support for iOS devices is also in the works - so this could also be a nice way to access your own projects via iPad while on the go.