Is there a free webinar platform?

Question

Software and Internet Services

Need a platform for a small webinar, free.
Required features:
- Two speakers
- Maximum 40 participants
- Screen
sharing - Guests must not be allowed to show video or speak voice
- Guests can write to the chat, but the chat is visible only to the administrator
Is there something like this?
The zoom is not suitable, because. you can’t prevent participants from showing videos (except for turning them off one at a time, which is also not suitable)

Answer 1

I think that Jitsi is quite suitable, especially since it is open source and you can make your own gadgets.