Apple iChat AV
Free Communication Program for Mac - Apple iChat AV
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Free Communication Program for Mac - Apple iChat AV
Feem for Mac: Painless Local Sharing
Express Talk: Virtual telephone compatible with most VOIP services
A free app for Mac, by Blackholemedia.
A great alternative Twitter app for OS X
Confide: An Encrypted and Highly Secretive Messenger App
Sync Adium and Address Book
Viber on your Mac Desktop
A free program for Mac, by Crossloop.
ooVoo: Free Multiple Video Chat Client
Easy local network communication
Scalaris: An Elegant and Discreet Twitter Client with Growl Support