Unfortunately Jitsi was acquired by Atlassian, so I don't think you'll see many advances there. They were (are) some of the best at working with WebRTC. Edit:

Unfortunately Jitsi was acquired by Atlassian, so I don't think you'll see many advances there. They were (are) some of the best at working with WebRTC. Edit: I would put more stock on Appear.in. They also have some of the best people, and they have recently launched a monetization plan (I was worried about that part)