Prezi

Prezi is used as platform for bridging linear and non-linear information, and as a tool for both free-form brainstorming and structured presentation. Text, images, videos and other presentation media are placed upon the canvas, and can be grouped together in frames. Users then designate the relative size and position between all presentation objects and may pan and zoom in and between these objects. For linear presentations, users can construct a prescribed navigation path.
Prezi is a free program that can potentially be used for any classes. This is another presentation website, but it is limited to just slides. I've used it for history when I had to create a presentation on the wepaons of World War II.