Juggling Animation Creator allows you to create and customize juggling patterns to study it closely. The program will create a java applet animation of whatever trick you create. Animation are clearly show, and can be slowed down.
You can select any number of balls, sync or async juggling patterns, and different types of juggling such as Mill's Mess.
Learn pre-created patterns, or even make your own unique ones. The software requires java, which most is installed on most computers anyways.
It is lightweight, highly customizable, and easy to use.