"Remind 101 has released a free iPhone app. Remind 101 is a service for sending text messages to groups of students and their parents. The service is an opt-in service which means that students and parents have to enter a confirmation code to state that they do want to be contacted by you through the service. Remind 101 keeps phone numbers hidden so that the parties cannot see each other's numbers."
Videoscribe is an IOS app that lets you or your students create presentations that look as though they are being hand-drawn right in front of you. You've probably seen this style of animation recently, (like this from Sir Ken Robinson) they've become quite popular.