Free
MSN Messenger
MSN Messenger: Free Chat Application for Mac
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A free program for Mac, by Bharti Airtel Ltd.
A full version program for mac
A free program for Mac, by messenger.
Comprehensive Overview of Tweetie for Mac
A free program for Mac, by Gao Wei.
Feature-Rich Chat Application for Mac Users
One-click calling and answering
AIM for Mac: A Classic Instant Messaging Client
Jitsi: Free Instant Messaging for Mac Users