Free Android Phone app: https://play.google.com/store/apps/details?id=com.zondle.mobile
Free iPad app: https://itunes.apple.com/us/app/zondle/id497342127?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/zondle/id497342127?mt=8&uo=4&at=10l6SU
Website: http://www.zondle.com/
Edmodo app: http://www.edmodo.com/publisher/zondle
Free iPhone app: http://itunes.apple.com/us/app/mermaid-waters-adventures/id454136246?mt=8&uo=4&at=10l6SU
Website: http://www.mangahigh.com/
Paid iPad app: http://itunes.apple.com/us/app/spelling-hero-custom-spelling/id458589126?ls=1&mt=8&uo=4&at=10l6SU
Paid iPhone app: http://itunes.apple.com/us/app/spelling-hero-custom-spelling/id458589126?ls=1&mt=8&uo=4&at=10l6SU
Free iPad app: http://itunes.apple.com/us/app/motion-math-zoom/id451793073?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/motion-math-zoom/id451793073?mt=8&uo=4&at=10l6SU
Website: http://www.kerpoof.com/