We started out building online tools for education but soon began using them to have our own meetings. Behind the scenes, things are powered by a CRDT (specifically, https://github.com/y-js/yjs) and we're using Janus as a WebRTC SFU.
It's not peer to peer, but this brings some advantages (simplicity, more reliable connections, better support for large rooms) and a few disadvantages (bandwidth usage, among others). We're still in beta and working on new features and bug fixes so any feedback is greatly appreciated!
We've got a pretty long pipeline of features, one of them includes a better setup for things like webinars, with one presenter and a large number of consumers.
Since I've seen the latter behavior more frequently it seems to be the more intuitive/usable option, though that's just my experience.
Looks really nice and runs smoothly. I've been working on and off on something that is vaguely similar in terms of kinds of tech being used: a vtt for DnD 5E. The link is in my profile if you are curious.