PicView - a free iPad app that makes it easy to create simple photo stories. PicView allows you to create an audio recording about a picture. You can add narration to pictures that you take with your iPad.
GoClass app - is a free iPad application that allows users to create lessons and share them with their students. Documents can be broadcasted through student devices and/or by projector or TV. GoClass allows users to formulate questions, draw diagrams, and share materials with students in class. Teachers can also keep track of what students are using which lessons, and when they are using them