Janus [1] is a much more capable webrtc gateway that's pluggable to do anything you want. Jitsi is like a Wowza type server. Stay away.
Jitsi Meet seems to be a turnkey thing where you can just self host an instance and have users create video meetings without too much fuss.
Janus is more of a Swiss Army knife, vs a all-in-one app for a specific use case for webrtc.