ICB (Internet Citizen's Band) - an internet teleconfrencing program that uses a client-server model to allow users across the Internet to communicate with each other.
Ztalk, TCP/IP Voice Communication - Ztalk is a low-bandwidth, voice communication tool for tcp/ip networks. Its a fully functional, voice-messaging system that is perfect for low-bandwidth systems, such as SLIP, PPP or 56kbs links.