Jing (Screen Capture)
Jing is a free application for Windows or the Mac OS that allows you to "capture" images or video of your desktop. It is a simple tool for creating "screencasts" comparable to SnapzPro.
Once a video of your computer screen has been recorded, it can be edited with tools like:
iMovie: iMovie is a basic video editing program
FinalCut Pro: Final Cut Pro is a more advanced video editing program