1000 _participants_ on a call, or 1000 _viewers_? Our org switched from Google Meet to their streaming equivalent once we hit around 250 people, nothing worked

1000 _participants_ on a call, or 1000 _viewers_? Our org switched from Google Meet to their streaming equivalent once we hit around 250 people, nothing worked well with that many participants. Lucky for your org, streaming has been a solved problem since the 90s! It looks like Jitsi might support streaming by itself, or you can find online tutorials on Nginx + Varnish RTMP streaming and DIY if you prefer. To answer your literal question, there is no enterprise grade open-source zoom alternative because it's incredibly difficult and hard to make work for free. You have seen how hard just in your N=1000 sample size. Adding in self-hosted STUN or TURN or building your own proxy and video muxer is only going to be harder. There's a reason YouTube, Twitch, Facebook, Instagram, Vimeo, etc. are good at it, because they're zillion dollar companies that can afford to invest in the massive infrastructure and engineering required to make it not-terrible.