This is a really cool open source free program.

Tracker Video Analysis and Modeling Tool for Physics Education

You can take a video of a pendulum for example and put that video into the program and then identify the points in the video you want to track and it will analyze the movement in distance, etc... There are quite a few things you can do with this and most I'll never use.

If you use this, please share your experience so others can learn about it. I haven't had time to use it yet - just got it installed.