Gobby is a free and open source collaborative cross-platform real-time editor. It was realeased in June 2005.
I has an included chat that has very much an irc taste and a collaboratively editable document, MoonEdit taste. Every gobby can host a session. A standalone server, like on MoonEdit and in use with the ting-wiki is rudementary existant but is not fully implemented.
gobby-wiki: installation guide. On this wiki and the attached developement page you find a lot of material on the programms progress.
MattisManzel 22:06, 15 Jun 2005 (CEST): Finn and me tested gobby yesterday, very cool. The chat is very irc'ish, maybe it is even possible to conjuct gobby with irc somehow. Everybody can host is cool too, burt the standalone server not yet working is still un-cool. MoonEdit on win has typing sound (which I love) and a magnificient history (wich I love as well). That chat on gobby can't be saved I fear, and it has not sound. But it is o p e n s o u r c e! Yeah!