Download of CornerFix 1.4.2.5 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. CornerFix-1-4-2-0-Mac-Exec.zip is the frequent file name to indicate this application's installer.
The application is included in Design & Photo Tools. This free software for Mac OS X is a product of Sandy McGuffog. 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. The most popular version among the program users is 1.4.
From the developer:
CornerFix corrects for vignetting effects in digital images. It's most often used to correct for the color vignetting that occurs when wide angle lenses are used with digital sensors that include IR filters, resulting in so-called "Cyan Corners".
CornerFix was originally written for the Leica M8, but now supports any camera that either directly produces a DNG format image file, or produces an image that can be converted to DNG.
You may want to check out more Mac applications, such as Smith Chart for Mac, Keynote Action Pack or Piranesi, which might be related to CornerFix.