I've tried out used Jitsi as a Service (JaaS) at https://jaas.8x8.vc. It works fantastic. You can embed a Jitsi meeting app in your website, web app, mobile app with ease. Just copy/paste some HTML. You can use 25 calls per months for free.

chaum

Thanks, it looks like they've dropped support for Firefox unfortunately. I'll try it again with another browser like Brave. 

You can use the free instance or self host it. It lets you generate invitation links and lets you discriminate between admin partecipants and simple partecipants.

privacy

What are some good FOSS tools to use for video calls with 1 or more persons?

Jitsi meet

You can use the free instance or self host it. It lets you generate invitation links and lets you discriminate between admin partecipants and simple partecipants.

Have a go, you might like it