Paid iPad app: http://itunes.apple.com/us/app/stack-the-states/id381342267?mt=8&uo=4&at=10l6SU
Paid iPhone app: http://itunes.apple.com/us/app/stack-the-states/id381342267?mt=8&uo=4&at=10l6SU
Website: https://quizlet.com/
Edmodo app: http://www.edmodo.com/publisher?uid=507204
Free iPhone app: https://itunes.apple.com/us/app/quizlet/id546473125?mt=8&uo=4&at=10l6SU
Google Chrome app: https://chrome.google.com/webstore/detail/quizlet/bgofflgeghkhocbociocnckocbjmomjh
Paid iPad app: http://itunes.apple.com/mg/app/geopop/id489992345?mt=8&uo=4&at=10l6SU
Website: http://www.lessonplans.com/
Website: http://www.youtube.com/teachers
Website: http://www.nationalgeographic.com/