Author of Peer Calls here, an open source, anonymous WebRTC multi-user conferencing solution. I recently ported the app that Go and added an SFU (thanks to pion/webrtc) to make support for 3+ users better. Works on all recent major browsers (including Safari on iOS).

See https://github.com/peer-calls/peer-calls for more information.

You can host it yourself or use peercalls.com

Happy to answer any questions in this thread.