Nearpod a free all-in-one sychchronized use of iPads, iPods, mobile phones, computers etc that includes polls, quizzes, etc.
Poll Everywhere It's the easiest way to gather live responses in any venue: conferences, presentations, classrooms, radio, tv, print — anywhere.
Socrative Socrative is a smart student response system that empowers teachers to engage their classrooms through a series of educational exercises and games via smartphones, laptops, and tablets.
Literacy Shed is a great one-stop-shop for inspiration and ideas to improve literacy and critical thinking in your classroom. Students watch various videos from different genres and then discuss/write about them. The webpage has lesson ideas for each video.