PingPong: Simple, Interactive, Free Q&A App For Teachers

I've recently met with the creators of PingPong, an app that is aimed at providing a higher level of interaction between teachers and students. It works by simply letting teachers create questions either on the spot (during class), or as a series or prepared questions (exam-style) that students will have to answer, possibly in a limited time. The beauty of the app really resides in its simplicity and the fact that it is free. The user interface may appear a little Spartan, but that's exactly why it works so well: it is extremely easy to build questions, and answering them is even easier.

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