• Digsby = IM + Email + Social Networks
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• MyGADs
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• Pidgin, the universal chat client
  
  A free chat client used by millions. Connect easily to MSN, Google Talk, Yahoo, AIM and other chat networks all at once.
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• Trillian
  IM, Astra, Windows Live, Facebook, Twitter, Yahoo, MySpace, AIM, Email, and more!
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