Evan has already written an article about Pidgin already where he mentioned Adium, but I felt that Adium deserved its own article considering how great it is.  Back when I did not have a Mac, Adium was the application that made me jealous of Mac owners.  Adium supports all the major IM platforms and even a bunch that I have never heard.  The current beta version even supports Facebook chat.  Adium has a large library of Xtras that includes everything from user interface skins to a plugin that lets you chat with your friends on Skype.  Like any good Mac app, Adium supports Growl notifications, animated dock icons, and an active menu bar button that adds to the usability of Adium.  It feels less like an program running on the operating system and more like something built in from the beginning.

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