PowToon is a simple, web-based cartoon creator that can create simple, fun presentations.  The program is web-based so that means that you can start on one computer and finish on another.  There are ample free options inside the program and it is very simple to use.  Instead of creating a boring presentation, you can create a piece of media that involves animations along with sounds and text.  This gives students, and teachers, another option when looking for how to create something to show their learning.