IM utopia
For Mac OS X, Adium allows users to use one instant messaging (IM) client application to connect to multiple IM services.
For Windows, Linux, BSD, and other UNIX platforms, Pidgin offers the same.
They allow you to connect to AOL Instant Messenger, MSN Messenger, Yahoo Messenger, .Mac/Apple Chat, GoogleTalk, Lotus SameTime, MySpaceIM, and many more. [...]
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