Ask HN: Are there any video conference tools suited for debating/discussions?

Ideally, the software should have the following capabilities:

* Allow for a moderator with 'muting' rights

* Creation of agendas

* Giving each speaker an allotted amount of time (microphone is muted after)

* Allowing people to sign up for 'replies', which will give them a given amount of minutes to reply to what has been said

* Allowing people to sign up for 'comments', which will give them another given amount of minutes to comment

* Total amount of comments per 'case' is set, as well as the total amount of minutes for the case as a whole.