Prezi is a presentation software that uses a visual layout instead of slides. You can still embed images and video clips like you can in Power Point and other Presentation software. Prezi operates on the pricing model where limited use is free and users who use a lot of space, or a desktop development client -instead of online- pay more.
Prezi recently announced that educational users will get 500 megabytes of storage with their free accounts instead of 50 megabytes. Educational users can also remove the Prezi logo from their presentations with their free account.