These are one minute(ish) app reviews of pretty useful apps for both pedagogy and professional use.

Socrative for Android - FREE
Socrative Student - https://play.google.com/store/apps/details?id=com.socrative.student&hl=en
Socrative Teacher - https://play.google.com/store/apps/details?id=com.socrative.teacher&hl=en

Socrative for iOS - FREE
Socrative Student -  https://itunes.apple.com/us/app/socrative-student/id477618130?mt=8
Socrative Teacher - https://itunes.apple.com/us/app/socrative-teacher/id477620120?mt=8