I have not downloaded and used any of these, so this is not a recommendation.
Tired of being stuck in the boring bullet point rut? This article explains how to use other instructional tools, such as hot spots and tabs to get your points across.
I am currently watching a course at lynda.com on Design 101 Presentation, taught by John McWade.. Everyone who gives PowerPoint presentations should watch this course. A fdw of his rules are: