Gaming Middleware
A Game Engine is the core software component of a video game. It typically handles rendering and other necessary technology, but might also handle additional tasks such as game AI, collision detection between game objects, etc. The most common element that a game engine provides is graphics rendering facilities (2D or 3D).
From : en.wikipedia.org/wiki/Game_engine
Gaming Middleware developers attempt to "pre-invent the wheel" by developing robust software suites which include many elements a game developer may need to build a game. Most middleware programs provide facilities that ease development, such as graphics, sound, physics and AI functions.
From : http://en.wikipedia.org/wiki/Game_engine#Middleware
Mumble
Mumble is a voice chat application for groups. While it can be used for any kind of activity, it is primarily intended for gaming.
The client, Mumble, runs on Windows XP and Linux. The server component, Murmur, should run on anything you can compile Qt 4.0 on.
Mumble has very low latency combined with good sound quality; it uses Speex extensively, not just the voice compression technology, but also the voice preprocessing to remove noise and improve clarity. Mumble also has positional audio for supported games, meaning the other players' voice will come from the direction their character is in game.
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Mumble
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