This is psyced, a scalable multi-protocol multi-casting chat, messaging and social server solution to build decentralized chat networks upon, released as free software. Powerful, not bloated, not too hard to get into.
psyced supports the following protocols and formats:
PSYC, XMPP S2S, IRC, TELNET, HTTP, SMTP, OAuth, XML, RSS.
It also has limited/experimental code for the following things:
Clients using XMPP C2S, Java Applets, Status.Net, WAP, NNTP. More Info »