the author of this app says:
Siteswapper is a program for generating and viewing juggling patterns that can be described with the siteswap notation. By specifying the number of balls, the maximum height of a throw and the maximum length of the siteswap number sequence, the program can calculate all matching siteswaps. The generated siteswaps can also be animated.
For a full list of features, please see the author's home page.