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Free iPad app: http://itunes.apple.com/us/app/screenchomp/id442415881?mt=8&uo=4&at=10l6SU
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Free iPad app: https://itunes.apple.com/app/student-clicker-socrative/id477618130?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/app/student-clicker-socrative/id477618130?mt=8&uo=4&at=10l6SU
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Edmodo app: http://www.edmodo.com/publisher/socrative
Google Chrome app: https://chrome.google.com/webstore/detail/socrative-student/nblhpecglllndfihipmpdoikimcmgkha