Animoto (make 30-second slide shows/videos)
PhotoPeach (make a slideshow/video with captions)
Prezi (a different kind of slide show)
Slidely (make an online slide show with your images)
SlidesMania (templates for presentations and other tools like interactive games, choice boards, and more)
Slides Carnival (templates for presentations and other tools like interactive games, choice boards, and more)