Why is there no enterprise-grade open-source Zoom alternative?

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I'd point to this related question. "Chat" services of various kinds have been around on the internet since the 1990s, the one thing that they all have in common is that they burn out. For instance there was CUSeeMe, Paltalk, Tivejo, AOL Instant Messenger, ICQ, Skype, WebEx, Facebook Messenger, and many others. Google alone has made 11. Some of them are still around, but there's a general pattern that a company does the work to create an application but doesn't do the work to keep it up. Then some new thing comes along, gets popular for a while, then deteriorates. Unless Zoom breaks the patter

What you are looking for is BigBlueButton: https://bigbluebutton.org/ It is targetting the virtual classroom market but it does general videoconferencing just right.

Sorry, I must be a luddite. I don't get the video conferencing craze. In most cases, I see little real, added value in a live video feed. What I find more generally useful is simple desktop/screen sharing with audio (i.e. GotoMeeting, TeamViewer) If you must see the participants, allow a photo/avatar. Watching real lips moving in a stuttered video is quite chic and nouveau and all ... it's nice with family ... but it doesn't really add much value in a typical business setting IMO. As with most things, there are exceptions but I use desktop sharing way more often.