Mumble

Mumble is a voice chat application for groups. It has low latency and superb voice quality, and features an in-game overlay. While it can be used for any kind of activity, it is primarily intended for gaming. It comes with it's own server called murmur, which features secure communication and full extensibility.
License Free
File Size 23.25 MB
Version 1.3.0
Operating System Windows XP Windows Vista Windows Windows Server 2008