In searching for education apps, I ran across this website: http://prezi.com/swceiv2g3bbt/60-educational-apps-in-60-minutes/ which has a good Prezi presentation called "60 Educational Apps in 60 Minutes" by Clint Stephens, that gives a good overview of great iOS apps that are available out there for educators. Not all of them are free, but they all seem worth considering having in your toolbox. See the Prezi below.