My favorite is BigBlueButton. Especially when people are forced to 
participate (students) as this software respects their data privacy. It 
was developed for educational uses.
https://en.wikipedia.org/wiki/BigBlueButton

If you want to see how it works, here is a server in Germany maintained 
by university students. Ideally in the end people would self-host this 
software.
https://www.senfcall.de

The interaction (upvoting questions and polling) would have to be done 
off-site, but I think this goes for all systems I know.

If you can code, you can add such capabilities using H5P. 
https://en.wikipedia.org/wiki/H5P



On 03/02/2021 13:46, Sergio Letuche wrote:
> Greetings,
> 
> Do you have any suggestions on which software to use, in order to
> create webinars for our users?
> We would like to have the option to record our webinars, to share our pdf
> notes with our users, to be able to mute their microphones from time to
> time, to allow them to make questions and upvote them, to create a poll,
> 
> what do you think we should use and why?
> 

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