jamulus - 3.9.1+dfsg-1 main

Jamulus, a low-latency audio client and server, enables musicians to
perform real-time “jam” sessions over the internet. It is available
across multiple platforms, so participants of any field can communicate
without specialist setup requirements. This is not restricted to music,
of course; other use (perhaps conferencing?) is also possible.
.
One participant starts Jamulus in server mode, ideally on a dedicated
server (virtual) machine; all participants start the (graphical) client
which transmits audio to the server, receiving back a mixed stream. Use
of a metronome is recommended.