Download of Iconoclast 1.13 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software belongs to Design & Photo Tools. We recommend checking the downloaded files with any free antivirus. This free software for Mac OS X is an intellectual property of Galactic Computing Ltd.
From the developer:
Iconoclast allows you to drag a base icon (1024x1024 ideally) to the window and generate the series of icon sizes required for app submissions.The ability to alter the inbuilt icons sizes to whatever variants you want has been added. This allows the app to produce new icon sizes without the need to wait for the app to be updated.
You may want to check out more software for Mac, such as iPodEditor, OnTheAirCGServer or Flickr Widget, which might be related to Iconoclast.