I mean Jitsi is the most obvious solution.

I use MiroTalk since Jitsi implemented "moderator" authorization.

Unsure what you want to accomplish exactly, but if all you need is just literally to share your desktop and the sound from it, OBS Studio is great for that. It doesn't even matter if whatever video platform you're using supports screen sharing, you can just do it yourself very easily using OBS's dead-simple Virtual Camera feature.

Banana! You don't really even have to "host" it per se

Neko.