Proteus is a popular instant messaging client for Mac OS X that supports multiple protocols through the libgaim library. Proteus is written using OS X's Cocoa API, and it is released under the free software GNU General Public License.

Supported protocols:
* Bonjour (for local networks, formerly known as Rendezvous)
* Gadu-Gadu
* Jabber (incl. Google Talk)
* Lotus Sametime
* MSN
* OSCAR (viz ICQ, AIM and .Mac)
* Yahoo! Messenger and Yahoo! Japan

Proteus Screenshots:



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