1)   sharpVoice(tm) Client 6.0
sharpVoice is a internet telephony program that enables free PC-to-PC and inexpensive PC-to-Telephone voice conference calls even with slow internet connections.

 2)   damaka 2.0
damaka enables you to make free phone & video calls anywhere in the world. damaka uses innovative standard's based (SIP) peer-to-peer (P2P) technology to connect you with other users. It also offers free conferencing, voicemail & file transfer.

 3)   BeyondPhone 2.4.1.0
BeyondPhone is future of internet telephony. You can make substantial savings on every outgoing call. Call anywhere in the world from your computer. For high call clarity and low calling rates , for details visit our website http://beyondphone.com

 4)   TeamTalk 3.0
TeamTalk is an internet based voice conferencing application that allows you to talk with your friends and colleagues using the internet as audio carrier.

 5)   OfficeIntercom Communication Software 4.01
OfficeIntercom lets you use your computer to speak to others over the internet or your local office computer network. It works like a virtual intercom.