Adium is a free instant messaging application for Mac OS X that can connect to AIM, MSN, Jabber, Yahoo, and more.
* Updated libpurple
o Fix a crash when some clients send contacts in a format we don't understand on ICQ.
o Fix blocking and other privacy lists on AIM/ICQ.
o Fixed CAPTCHA not working properly on Facebook.
* Fixed iChat emoticons on Snow Leopard.
Internet and communication
Mac OS X
Product page: here