Great apps for teaching STEM subjects.
Free iPad app: https://itunes.apple.com/us/app/drawp-for-school-collaboration/id794209888?mt=8&uo=4&at=10l6SU
Free Android Tablet app: https://play.google.com/store/apps/details?id=com.moondrop.drawpedu
Google Chrome app: https://chrome.google.com/webstore/detail/drawp-for-school/fbjjojpjgjkpoehlggmbgpalkmcaohic
Free Mac program: http://drawpforschool.com/download/
Free Windows program: http://drawpforschool.com/download/
Paid iPad app: https://itunes.apple.com/us/app/amazing-digestive-journey/id598920877?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/amazing-digestive-journey/id598920877?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/native-numbers-lite-number/id593188849?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/native-numbers-complete-number/id570231808?mt=8&uo=4&at=10l6SU
Paid Android Phone app: https://play.google.com/store/apps/details?id=com.wewanttoknow.DragonBoxPlus
Paid iPad app: https://itunes.apple.com/us/app/dragonbox-algebra-5+/id522069155?mt=8&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/dragonbox-algebra-5+/id522069155?mt=8&at=10l6SU
Paid Mac program: https://itunes.apple.com/us/app/dragonbox-algebra-5+/id524967552?mt=12&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/goreact/id649585694?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/goreact/id649585694?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/move-turtle.-programming-for/id509013878?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/move-turtle.-programming-for/id509013878?mt=8&uo=4&at=10l6SU
Website: http://www.khanacademy.org/
Free iPad app: https://itunes.apple.com/us/app/id469863705?mt=8&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/id469863705?mt=8&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=org.khanacademy.android
Free Android Tablet app: https://play.google.com/store/apps/details?id=org.khanacademy.android
Edmodo app: https://spotlight.edmodo.com/product/khan-academy,324527/
Paid iPad app: http://itunes.apple.com/us/app/elements-visual-exploration/id364147847?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/stamp-game/id389994166?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/toca-lab/id748057890?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/toca-lab/id748057890?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/grid-lines-ordered-pair-game/id630187892?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/grid-lines-ordered-pair-game/id630187892?mt=8&uo=4&at=10l6SU
Website: http://www.ssgreatbritain.org/full-steam-ahead
Free iPad app: https://itunes.apple.com/us/app/full-steam-ahead/id692787151?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/full-steam-ahead/id692787151?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=air.com.aardman.ssgreatbritain.fullsteamahead
Paid iPhone app: https://itunes.apple.com/us/app/bridge-constructor-playground/id578203499?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/bridge-constructor-playground/id578203499?mt=8&uo=4&at=10l6SU
Paid Android Phone app: https://play.google.com/store/apps/details?id=com.headupgames.bridgeconstructorplayground
Free Android Phone app: https://play.google.com/store/apps/details?id=com.headupgames.bridgeconstructorplaygroundfree
Paid iPad app: https://itunes.apple.com/us/app/land-venn-geometric-defense/id878168094?mt=8&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/land-venn-geometric-defense/id878168094?mt=8&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/earth-primer/id956678532?mt=8&uo=4&at=10l6SU