Teamspeak

Teamspeak::News: "Teamspeak is a quality, scalable application which enables people to speak with one another over the Internet. Teamspeak consists of both client and server software. The Teamspeak server acts as a host to multiple client connections, capable of handling literally thousands of simultaneous users. This results in an Internet based teleconferencing solution that works in a variety of applications such as team mates speaking with one another while playing their favorite online game, small businesses cutting costs on long distance charges, or for personal communication with friends and family.

Among Teamspeak's incredible range of features are crystal clear voice communication, Windows/Linux cross-platform design for both the client and server, a built-in web based administration panel for the server, and a highly scalable user permissions system. An added feature to Authorized Teamspeak Host Providers (ATHPs) that wish to rent servers to their customers includes the ability to spawn multiple instances of the server from a single server session, thus easily facilitating 'server-farming'."