Website: http://www.mathletics.com/
Free iPad app: https://itunes.apple.com/us/app/math-fight-fun-2-player-mathematics/id738947827?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/math-fight-fun-2-player-mathematics/id738947827?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/app/math-champ-client/id516219415?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/app/math-champ-client/id516219415?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/ezymaths/id563471869?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/ezymaths/id563471869?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/math-equations/id698290670?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/math-equations/id698290670?mt=8&uo=4&at=10l6SU
Google Chrome app: https://chrome.google.com/webstore/detail/bhdheahnajobgndecdbggfmcojekgdko
Website: https://www.desmos.com/
Edmodo app: http://www.edmodo.com/publisher?uid=3382251
Free iPad app: https://itunes.apple.com/us/app/graphing-calculator-by-desmos/id653517540?mt=8&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/graphing-calculator-by-desmos/id653517540?mt=8&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.desmos.calculator
Free Android Tablet app: https://play.google.com/store/apps/details?id=com.desmos.calculator
Paid iPad app: https://itunes.apple.com/app/wolframalpha/id334989259?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/app/wolframalpha/id334989259?mt=8&uo=4&at=10l6SU
Paid Android Phone app: https://play.google.com/store/apps/details?id=com.wolfram.android.alpha
Paid Android Tablet app: https://play.google.com/store/apps/details?id=com.wolfram.android.alpha