Before I do, I want to mention Prezi- this is likely the most common of the tools I will share.
More importantly, I want to highlight three important points about these tools.
- There is nothing to download. (Though on an iPad, Magisto is an app)
- They are accessible to view on any device that accesses the web.
- Did I say, free? (Mostly true. Sometimes there will be pro and premium versions that do cost somy money.