Mumble is a voice-over-IP (voice-over-network) solution and FOSS project.
Mumble is a well-established project and software with a long history and rich feature set.
You can find out more about the Mumble software and its capabilities on our website mumble.info.
Here on GitHub, we host numerous repositories for our development and modifications of third-party libraries.
On our website you can find general contribution guidance - how you can get involved.
The individual repositories have more specific documentation about the respective sub-projects they host.