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Mumble

A low-latency, high-quality voice chat application.

Mumble is a self-hostable voice-chat application originally built for online gaming. It pairs an Opus-based voice codec (very low bitrate for very good quality) with positional audio — in supported games, voices fade with distance and direction in 3D space, which makes it especially well suited to team- based games and tabletop RPGs run over the internet.

The Mumble server (murmur) is small, lightweight, and easy to host. Channels are organised in a tree with per-channel permissions; users can move freely between channels they have access to. The protocol is simple enough that several third-party clients exist alongside the official Qt-based desktop client.

Mumble has been continuously developed since 2005. It remains a popular choice for radio amateurs, gaming communities, free- software user groups, and small organisations that want encrypted, self-hosted voice without the latency or licensing of commercial alternatives like Discord or TeamSpeak.

Debian/Ubuntu: sudo apt install mumble
Fedora/RHEL:   sudo dnf install mumble
Arch:          sudo pacman -S mumble
macOS:         brew install --cask mumble