About PSYC:

"Imagine smartly multicasted chat and conferencing, non-proprietary instant messaging, distributed social networking and data sharing. And now imagine all of this rolled into one. PSYC is an open source protocol and technology, bringing the useful and amazing aspects of several technologies, some of which have been proprietary too long, together." Read More.

PsycZilla is a PSYC Client for the Mozilla platform. PsycZilla started as a PSYC extension for Firefox and eventually branched out into standalone XULRunner applications for Linux and Mac OS X. You can read more about PsycZilla at http://www.psyc.us