Take a look at some of the hottest online and mobile tools for showing, explaining, and retelling in this infographic, “Show What You Know Using Web & Mobile Apps.” These web and iPad apps can turn students into teachers and teachers into super-teachers! Furthermore, most of the apps listed in the infographic are free of charge.
http://learninginhand.com/blog/show-what-you-know-using-web-mobile-apps-infographic.html