I don't know anything about EveryBuddy, but for a cross-service IM client, Fire.app is okay -- and it's GPL too! It's just not as cute as iChat though... :) Also, if you've got Fink/OroborOSX, Gaim is an option -- I seem to recall that can do multiple protocols now...
http://www.everybuddy.com/en/download.php
And it does run on OSX according to this page.
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