psi

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. psi contains all the features necessary to chat, with no bloated extras that slow your computer down. The Jabber protocol provides gateways to other protocols as AIM, ICQ, MSN and Yahoo!. Attention! This package is an old-stable branch of the Psi Instant Messenger. If you want modern features, including voice and video calls, OMEMO end-to-end encryption support, consider switching to the psi-plus package.

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