A few things you may have heard of, but still good info. I enjoyed learning about this one in particular:
Socrative – This is an amazing online tool that promises to engage the class using any device. 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. Spark discussion with open ended questions, look for student understanding, provide formative assessment, and even integrate a few games and Wordle. This is a tool that is definitely worth a closer look.