Software to live-stream presentations I would like to be able to live-stream presentations online in case my school closes. My presentations are in power point. Ideally I would like to share my screen so I can use other software simultaneously. Finally I would like student to be able to ask questions from home and be heard by everyone, but I would like to have control over who is heard.

Any software recommendations? Even better if it's open source, or at least free
At my university we use Zoom.

It allows you to host a room, share screens, create "breakout rooms" for group work, etc. Don't know what the limitations are as far as how much the free version gets you, but it would be worth poking around with.