Free PC-to-PC and cheap PC-to-phone / fax calls over Internet or ISDN / PSTN telephone networks. It turns the computer into a VoIP / SIP phone, ISDN phone / fax, voicemail, SIP server / registrar, VoIP switch / PBX and more. USB phone / headset support.
PeerMe has developed an instant messaging platform which supports Peer to Peer Voice, PC to PC and PC to handheld voice communications, instant messaging, and peer-to-peer file transfer all over public Internet connections.
IPi Phone is internet IP to IP telephone software that allows you to talk and usetext chat. IPi Phone is easy to use. All you need to know is the other person IP address and you can connect to them and start talking over the internet for free.