Since you are asking for a website: https://www.senfcall.de/en/ is a Big Blue Button instance, hosted by a German digital rights nonprofit that is very privacy-first and requires no signup.

Looks nice. Any way to install this natively (i.e. without Docker)? I’m running FreeBSD on arm64, so Docker is not available for my system (unless I set up an entire Linux VM for it, which would be a ridiculous overhead).