Yes, both Mentimeter and Panopto offer a Free Trial.
Mentimeter is designed for Large Enterprises, Medium Business and Small Business.
Panopto is designed for Large Enterprises and Medium Business.
Pricing for Mentimeter Starts at $9.99/User/Month when Billed Yearly whereas for Panopto Starts at $14.99/Month.
Some top alternatives to Mentimeter includes Glisser, CLiKAPAD, Zeetings, SlideLizard, Zoho Show, Slides, Vevox, Slido, Microsoft PowerPoint and AhaSlides.
Some top alternatives to Panopto includes Prezi Video, Zoom, Zoom Video Webinar, Camtasia, Powtoon, Zoho Show, Prezi Business, Cloudpresenter, Present Live and Microsoft Stream.