Trial version
ZIM
Chat and instant messaging server
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Instant Messenger with VPN support
A Free Communication program for Windows
Real-time video conferencing over the Internet
An AIM/iCQ alternative
Waver: Free Instant Messaging for Windows
WinPopup compatible one-way instant messenger
Discover invisible Yahoo! Messenger users and keep track of their online time
Call for free from anywhere
Efficient and simple forum system using PHP & SQL
When social networking meets corporate communication
Multifunctional messenger with TV, radio and more
Phone calls for free