Myplick is a free service that lets you share, embed and discover presentations and slide shows online. You can upload your presentation documents in a variety of formats such as powerpoint, pdf, etc. If you want to add narration or sound effect to your presentation, you can upload an audio file and have the option to synchronize the audio with your slides. After you create a presentation you will have the choice to either publicly share with everyone or only share it within a private group. You can also find out how users are viewing your plick, for example, how much time people stayed on each slide. This would be a good way for students to share their presentations with others.
This tool allows the user to create powerpoint presentations and share them on the internet. Once the presentations were created, they could be accessed from anywhere. This could be easily used in the classroom.
This site is really fun, and I think it would work for ALL ages:-) When I use it is when the kids are learning about a plot graph. We will read a short story that has clear elements (exposition, complications, etc), then the kids will have to change the story into their own words, showing me in each cartoon slide, that they understand what those elements are.