Nearpod is an interactive teaching and learning tool that allows teachers to construct presentations using the Nearpod website and deliver instruction to students by pushing content out to multiple devices at once. The teacher controls the presentation from a master device, while students follow along on a mobile device
Another 'neat' polling application that I played with today was Poll Everywhere. This one also allows a certain amount of 'free'dom before if offers you a payment package. Also I'm not sure about the charge for texting responses, that will depend on your phone package I guess.
My final play was Micropoll - test it now!