JackTrip supports bidirectional, high quality, uncompressed audio steaming with any number of channels. JackTrip is a command line program that works with the Jack Audio Connection Kit.
Instructions and Downloads
JackTrip is available for Linux, OS X, and Windows and the different versions can connect to any of the others.
The JackTrip source code is hosted on GitHub.
If you haven’t heard of it before, you will be hearing about it sooner or later, because the JACK audio connection kit is free and open source software that runs on Linux, Windows and Mac systems, and it is used to allow musicians to jam together in apparent real time over a network connection, in addition to being the backbone of a digital audio studio.
JACK Audio Connection Kit Home Page