Psi is a free/opensource Jabber/XMPP (instant messaging) client for Windows, Mac OS X or GNU/Linux. Built on Jabber/XMPP, Psi is designed to be fast and lightweight.
The overall goal of the Psi project is to create a free/opensource, powerful, yet easy-to-use Jabber/XMPP client that tries to strictly adhere to the XMPP drafts and Jabber XEPs. In most cases, Psi will not implement a feature unless there is an accepted standard for it in the Jabber community. This practice helps Psi be stable, predictable, and Jabber compatible, both from an end-user and developer standpoint.
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