http://www.freetech4teachers.com/2017/11/7-good-tools-for-surveying-your-audience.html#.WhwyiEpKtPY Polling--Using Q&A in Google Slides
http://www.freetech4teachers.com/2017/11/three-ways-to-broadcast-review-sessions.html#.WhwyxUpKtPY
Captioning support for presentations:
https://www.microsoft.com/en-us/garage/profiles/presentation-translator/ Presentation translator is an add on for Microsoft Powerpoint that provides live captioning for people who are deaf or require information in a different language.
https://webcaptioner.com/http://www.streamer.center/
https://info.flipgrid.com/ Video response tool