An Instant Messaging application built upon Jabber.
Psi is a fast and lightweight messaging client that uses 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.
Jabber technologies are highly extensible, meaning that Psi is able to interoperate with other, proprietory messaging systems such as AOL’s ICQ and Microsoft’s Messenger so you can easily keep in contact with your friends, regardless of whether they use AIM, ICQ, MSNM or YahooM. It’s even possible to use Internet Relay Chat! (this requires connection to a Jabber server with suitable transports available).
Unlike other IM clients, Psi is small, fast and responsive. It uses a graphical toolkit called Qt, which takes on the appearance of whichever operating system you run it on. For this reason, Psi doesn’t use ‘skins’.
Psi has full support for Unicode so you can send and receive messages in other languages, even ones that aren’t based upon the English letterset. Psi can be used in a choice of several different languages.
Psi is also available for Microsoft Windows XP and GNU/Linux/KDE3.
For Mac OS X 10.2 and higher