Gobby - Google Wave Like Collaborative Editor
Gobby is a software for collaboration. It is similar to Google Wave but with its own taste. It supports multiple users and multiple documents along with a chat. What's best, it runs in Linux, Windows, Mac and Unix. It transmits changes character by character and highlights according to user's color. In terms of security, the transmission is encrypted and the session can be password protected. Chat support, Unicode support and syntax highlighting are its other features. Enough said, better check it out yourself http://gobby.0x539.de/trac/ Click here to install in Ubuntu.