Software Developmentr
ProjectilePlot is a simple projectile plotting program for Mac OS X. The goal behind writing this program was to provide physics teachers and students with a tool to visualize projectile motion. The strength of ProjectilePlot lies in its ability to "live update" trajectories as parameters are changed.

ProjectilePlot is freeware. All I ask is that if you find it useful or have suggestions please let me know.

System Requirements:

Mac OS 10.2 or greater

links:
Allegheny College: Physics Department
4BTV (college videos)
Cocoa Dev Central
comments/suggestions