Description:

Psi is the premiere Instant Messaging application designed for Microsoft
Windows, Apple Mac OS X and GNU/Linux. Built upon an open protocol named
Jabber, Psi is a fast and lightweight messaging client that utilises the best
in open source technologies.
The goal of the Psi project is to create a powerful, yet easy-to-use
Jabber/XMPP client that tries to strictly adhere to the XMPP drafts.and Jabber
JEPs. This means that in most cases, Psi will not implement a feature unless
there is an accepted standard for it in the Jabber community. Doing so ensures
that Psi will be compatible, stable, and predictable, both from an end-user and
developer standpoint.