iVision 1.2 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this Mac application is mactaris. We recommend checking the downloaded files with any free antivirus. The software lies within Design & Photo Tools, more precisely Viewers & Editors.
From the developer:
iVision allows you to adjust settings for your Apple external iSight FireWire webcam.
Features: View changes in real-time to your video as you move sliders and change other settings.
You may want to check out more software for Mac, such as Vectorworks 2010 Viewer, DropImageURL or Polaris, which might be similar to iVision.