if you're familiar with
WHIP (that I did write about in a
blog post some time ago), I just created a couple of repositories that can be used to test the server and client side of the specification:
The server is a basic node.js frontend to Janus (VideoRoom), while the client is a command-line application that uses GStreamer's webrtcbin. Before you ask, bug-fixing aside I don't plan to make them more complex than they currently are: they're meant as simple prototypes for interoperability testing, not production (even though I guess they could be extended to do that too, with a bit of work).
If it's something you're interested in, feedback welcome!
Lorenzo