You could have downloaded SAOImageDS9 8.4.1 for Mac from our software library for free. The actual developer of this free Mac application is ds9.si. Our antivirus analysis shows that this Mac download is safe. SAOImageDS9 for Mac is included in Education Tools.
From the developer:
SAOImageDS9 is an image display and visualization tool for astronomical data. With the Advanced View, DS9 has implemented icons that provide one-click access to many of the most common tasks: file open, region shape, bin/block/zoom, frame controls, and so much more.
In illustration mode, you can create graphics to be overlaid independent of underlying frames and color bars. You can export as PNG image or print as postscript.
You may want to check out more software for Mac, such as iRNAi, Gee or Arcade Math Blocks, which might be related to SAOImageDS9.