Mumble was the first and is the most successful and wide spread free and open source software for VoIP. It was the first VoIP software to provide low-latency audio suitable for gaming, and at the same time was a pioneer in high audio quality at the same time.
The in-game overlay shows users and who is talking in-game.
Mumble provides positional audio for certain games, meaning you can hear the people you play with from the direction they stand in in-game, and louder the closer they are (configurable).
Through additional scripting using the Ice protocol for communication, (e.g.) webinterfaces can be used for easier server management.
Combining the scripting interface with the positional audio data can switch users to teams channels or other useful automation.
An official iPhone client is available as well. For Android, no official client is provided, a but the community published a free client.
Mumble is continued to be maintained and developed by a small core team as well as the open community as a whole.
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⚫︎LightweightMumble consumes less device resources compared to similar apps.
⚫︎PortableMumble can be used from a USB stick or similar with no prior installation.