Website: http://www.flubaroo.com/
Website: http://getkahoot.com/
Free iPhone app: https://itunes.apple.com/app/apple-store/id1131203560?mt=8&at=10l6SU
Free iPad app: https://itunes.apple.com/app/apple-store/id1131203560?mt=8&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=no.mobitroll.kahoot.android
Free Android Tablet app: https://play.google.com/store/apps/details?id=no.mobitroll.kahoot.android