Mumble is an open source, low-latency, high quality voice chat software.
Mumble is a voice chat application for groups. While it can be used for any
kind of activity, it is primarily intended for gaming. It can be compared
to programs like Ventrilo or TeamSpeak. People tend to simplify things, so
when they talk about Mumble they either talk about "Mumble" the client
application or about "Mumble & Murmur" the whole voice chat application suite.