"ejabberd is a Jabber/XMPP instant messaging server, licensed under GPLv2 (Free and Open Source), written in Erlang/OTP. Among other features, ejabberd is cross-platform, fault-tolerant, clusterable and modular." (Source: http://www.ejabberd.im/)

ejabberd is a Jabber/XMPP instant messaging server, licensed under GPLv2 (Free and Open Source), written in Erlang/OTP. Among other features, ejabberd is cross-platform, fault-tolerant, clusterable and modular.

Source: http://www.ejabberd.im/