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openSpeak is a open source VoIP application made for gamers and all other users.

Collanos Phone is a VoIP softphone and multi-protocol Instant Messenger

fring is a free mobile VoIP application,this version for windows mobile 5.0/6.0

D-Voicer is a Voice over IP (VoIP) application suitable for corporate.

Join the VoIP revolution and enable your PC for all your telephone calls.

With VOIP Buster you can call your friends for free from your PC.

Speak Freely is a 100% software-based VoIP phone.

WengoPhone allows you to make VoIP calls all over the world,PC to PC, for free.

Free chat, IM (MSN, ICQ, Yahoo, AIM, Google Talk), SMS, VOIP, social games!

SIP SDK - A powerful and highly versatile VoIP SDK for SIP applications