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Edmodo app: http://www.edmodo.com/publisher/edcanvas
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Paid iPad app: https://itunes.apple.com/us/app/id431493086?mt=8&at=10l6SU
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Free Android Tablet app: https://play.google.com/store/apps/details?id=com.explaineverything.explaineverything
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Free iPad app: https://itunes.apple.com/us/app/super-notes-recorder-note/id484001731?mt=8&uo=4&at=10l6SU
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