If you are working on future interests with any of your students, one of the professors here at South Carolina has made a new mobile app for learning future interests called Future Interests Made Simple. It includes pictures, diagrams, graphics, examples, and lots of practice problems with explanations. It's available for iPhones, iPads, and Android phones for $2.99. I've taken it on several test drives, and I think it works pretty well. The links for it are below:
iTunes store: https://itunes.apple.com/app/id933368390
Google Play store: https://play.google.com/store/apps/details?id=appnotch.sec.hln7690
(Alex Ruskell)