Create questions and put them in a PowerPoint. Students answer by holding up a QR code card that you provide with A, B, C, or D side up and you use your phone to scan the answer cards. Like clickers but without the need for clickers.
FlipGrid is designed to provide students a way to discuss a topic using video. One suggested use is as a digital scavenger hunt. Want your 119 class to learn the important areas of campus, send them on a FlipHunt (see http://blog.flipgrid.com/news/fliphunt for ideas).