It's built in NodeJS/React/TypeScript, and I just recently ported the backend to Go because I wanted to build a Selective Forwarding Unit using pion/webrtc. You can test this in the alpha release on peercalls.com/alpha [2].
Would love to get more feedback and/or bug reports! Open source, available on GitHub [3].
I have been using this for our clients (edtech) for a while and with their 2.2 official version, they made it HTML5 only and removed flash. Works really well if you follow all the guidelines and installation instructions.
They also have a bash installer script [2] which literally does everything for you in one single script.
[0] https://docs.bigbluebutton.org