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.

Mumble is split into two applications: Mumble for the client and Murmur for the server component. Both of them run on Windows, Mac OS X and Linux.

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.