Came across this site https://ringingroom.com/ mentioned on the TV news this evening. It’s a “virtual bell tower” where fans of bell-ringing can gather to scratch their itch during lockdown in the UK and US.

The thing that strikes me is, it look remarkably similar, at least in concept, to Web conferencing software BigBlueButton https://bigbluebutton.org/. I wonder if it’s an application/customization of the latter?