Following the acquisition of etherpad.com by Google, the company announced that the EtherPad tool has now been open sourced. “Our goal with this release’s to let the world run their own etherpad servers so that the functionality can live on even after we shut down etherpad.com. If you’re just interested in running an etherpad server, these instructions should get you up and running. If you’re interested in digging into the code and improving etherpad, then we’ll try to support you in our spare time until we begin working full-time on Google Wave in February. For those ambitious hackers out there, perhaps it would even be possible to get etherpad servers to talk to one another, as well as Google Wave servers, via the Google Wave Federation Protocol,” writes Aaron.
More info: Google Code