Mumble is a VOIP (Voice over IP) application which allows users to speak on a chat channel, as in a telephone conference call. It was designed for gamers, who use the software to communicate with other players in the same multiplayer game.
Mumble is a relatively new arrival on the VOIP scene; it has been around in a stable form for about a year, at the time of writing. It takes advantage of newer technologies, such as sound quality and low latency, removing the noise from the audio input.
It is a cross-platform product which is free and open source. It is integrated with the game software in a customisable game overlay so that as well as hearing the other players, you can identify which is speaking. It supports advanced voice activity detection and will record conversations if set up.
To start you must set up the Mumble Server, called murmur, which features secure communication and full extensibility.
We think this is a product with a bright future. It looks easy to work with on the face of it, but running into difficulties is unnerving. It has live support team contact available. There is some technical support from community forums, and there looks to be a wish list for future development. It looks and feels like a product that is on its way up and it will be interesting to see if it develops for usage outside the game arena, but first it needs to grow new functionality, to include things like a user database.