Paid
One Chat All-in-One Messenger
Universal Chat Software for Social Media Applications
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MSN Messenger: Free Chat Application for Mac
Alternative to Microsoft Messenger supporting webcams
Video-conference with your usb webcam
Internet video conferencing and telephony for Mac OS X
Enhance Your Chats with More iChat Smileys
Use Skype remotely
A free program for mac
Jitsi: Free Instant Messaging for Mac Users