Meograph

In my opinion this is a fantastic and complete tool, but as many others, it has some advantages and disadvantages.
Advantages:
- You personalize it the way you want.
- It is useful for educational purposes.
- You can add vídeos, music, pictures, narrations.
- The lenght of the story can be set without restrictions.
- etc.

Disadvantages:
- It requieres an excellent internet conection.
- At the beginning, it's difficult to manage.
- You have to set time to each point of the presentation.

This tool allows us to include whatever we want so that the presentation becomes more attractive for the audience. Besides you are free to determine what kind of content to present or how.