Do you want live feedback from students during presentations or questions to respond to?
Zeetings allows comments from the audience that you can preview and share. This can be done synchronously or asynchronously and anonmously or not.
It can give you a powerful insight into whether your audience has understood. Also the audience is able to make notes on the presentation live in session. These remain as part of their account or if using anonymously they can email it back to themselves.