Psi is a free instant messaging application designed for the Jabber IM network (including Google Talk). Fast and lightweight, Psi is fully open-source and compatible with Windows, Linux, and Mac OS X.
With Psi's full Unicode support and localizations, easy file transfers, customizable iconsets, and many other great features, you'll learn why users around the world are making the switch to free, open instant messaging.
Internet and communication
Windows, Mac, Linux
Product page: here