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What's XMPP (official website)
XMPP FAQs (more)Overview: XMPP is the Extensible Messaging and Presence Protocol, a set of open technologies for instant messaging, presence, multi-party chat, voice and video calls, collaboration, lightweight middleware, content syndication, and generalized routing of XML data.
There are quite a few clients available. You can check the overview here. You can register by choosing a "name", which will make for the first part of the JID. JID: name@liberta.casa (and the password of your choice). Host: xmpp.liberta.casa Port: 5222 TLS/SSL: Enforced If you don't feel like installing any additional software, you can register for an account here, and use the Candy webchat, however keep in mind that this makes for an extremely rudimentary experience.