This app allows you to display PowerPoint presentations on your iPad. Could be great for students to use in a setting such as a science fair or history wax museum.
3DTOAD.com is a library of 3D images that you can rotate and explore. It includes skulls, skeletons, dissections, coral, geology, and even music. These could be great visuals on an Interactive White Board or used on an iPad.
This free app provides instant access to the Common Core Standards. Not sure what to do with it, but it could be useful from an administrative/lesson planning stand point.