This is a great little application that Christina Belton showed us at the PLG feedback yesterday. You basically print off these QR cards and get the students to answer multiple choice questions (similar to kahoot - but no computer needed by the students), you scan the room with your phone and it picks up their answers and displays them on screen.
https://get.plickers.com/
Here is a great video of how it works: https://www.youtube.com/watch?v=Qpx56rjCVjQ
