ScreenCapper 1.0 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Design & Photo Tools, more precisely Screen Capture. This software for Mac OS X was originally created by SilverCocoa. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
ScreenCapper is a simple tool to grab screenshots from your video files. It can generate a series of individual screenshots or a customizable screenshot grid. It's very easy to use and it will work with any video files that can be opened by Quick Time.
You may want to check out more Mac applications, such as RecordPro, ViewletBuilder6 Enterprise or Sequenz, which might be similar to ScreenCapper.