Mumble

Mumble is a low-latency, high-quality voice communications tool primarily intended for use while gaming. It is open source, licensed under the revised BSD license, and runs on Mac OS X, Windows and Linux. Mumble includes game linking, so voice from other players comes from the direction of their in-game location, and has echo cancellation so the sound from your loudspeakers won't be audible to other players.
LicenseFree
File Size14.52 MB
Version1.2.9
Operating System Macintosh Mac OS X 10.8 Mac OS X 10.11 Mac OS X 10.10 Mac OS X 10.9 Mac OS X 10.7