Back in the days (when I was a CS gamer), Ventrilo was the de facto application for group voice communications. However, Ventrilo has since then closed up their license and the public version is now limited to 8 slots. Is there a free alternative to Ventrilo? How does it differ from Ventrilo?
closed as off topic by KronoS, Tog, Luke, Scott, Brad Patton May 1 at 3:13
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There is Mumble, which is an open-source alternative working under Windows, Linux, and Mac OS X.
You can find the (long) FAQ here, and here are some interesting extracts:
I haven't used it myself, but from what I heard, it is quite satisfying. It can be however a bit harder to configure, from what I've been told. You can find a guide to configuring and using it at this link from their wiki.
Guide to their server (Murmur) can be found at this link.