Etherpad

Etherpad is an open source online editor used for Linux systems. Etherpad is a customizable editor which provides a collaborative editing in real time. It allows the users to write articles, press releases, to-do lists, etc. Its main objective is to import or export data to many exchange formats. It also can do simultaneously edit a text document, and see all of the participants' edits in real-time, with the ability to display each author's text in their own color.