Express Talk Basic - free VoIP software

Express Talk Basic - Free VoIP Softphone
Platform: Windows XP 2000/2003/Vista/2008
License: Free Download

Express Talk works like a telephone to let you make calls through your computer. You can call anyone via the internet who also has a softphone installed. You can also call regular telephone numbers if you have signed up with a broadband phone company or have a VoIP PBX. Connect your webcam and Express Talk will work as a video phone.

Calls computer to computer are always free. You can also call ordinary ‘real’ telephone numbers anywhere in the world if you sign up with a VoIP gateway service company. 
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Skype for Pocket PC - free Internet calling software

Skype for Pocket PC - Free software to make calls over Internet
Platform: Windows Vista, Windows XP, Windows 2000
License: Free Download
Skype is a software application that allows users to make telephone calls over the Internet. Calls to other users of the service and to free-of-charge numbers are free, while calls to other landlines and mobile phones can be made for a fee. Additional features include instant messaging, file transfer and video conferencing.
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