Adium X is an open source multi-protocol instant messaging application. It has been in active development for over a year; improved versions are released on a weekly basis. Join the instant messaging revolution!
Support for AIM (OSCAR), ICQ, Yahoo!, Yahoo! Japan, MSN, Jabber, Novell
GroupWise, Napster, and Gadu-Gadu
Unlimited accounts, as many names on as many services as you want
Draggable tabs; any number of tabs in any number of windows
Highly customizable, yet very intuitive preferences
Address book integration
iTunes and other Applescript substitution
Buddy icons in AIM, MSN, and Yahoo
The beginnings of file transfer support for AIM, Yahoo, MSN, and Jabber
Much, much more.
Mac OS X 10.2
Mac OS X 10.3
||Mac OS X 10.2.8 or higher