Link to the site: http://app.emaze.com/
Emaze is a online presentation creator, it has a nice easy to use interface that makes adding images,videos and text. You can also add shapes and it contains a number of useful icons, you can resize and insert. Videos can be inserted from YouTube and Vimeo.
It also possible to upload and an existing Powerpoint and as they 'emazify' it. The free account is limited to three presentations which have to be saved publicly.
However there are lots of predetermined templates available to be edited, with the 3D template providing an interesting alternative to Prezi. The finished presentation can be linked to or embedded into a web page.
Here is a link to the one I have created http://app.emaze.com/1032295/my-foilio