Psi: the truly open messaging application.
First of all, if you're a new Psi user or you're just interested: see the PsiWiki for documentation, FAQ, and design documents.
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.
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