Download of Iconset 2.0 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 actual developer of this software for Mac is MacMedia. The bundle id for this application is com.macmedianet.iconset.
The application lies within Theming Tools, more precisely Icons & cursors. The most popular version of Iconset for Mac is 1.0. 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:
A simple developer tool for creating the complete icon set from the 1024x1024 png picture file. The iconset folder is created on your hard drive. All you need to do is add the iconset folder to your Xcode project. Xcode 4.4 automatically validates and converts the iconset folder to an icns file. Then, in Xcode, it is required to enter the filename (Icon.icns) for the Icon file key located in Target Info Properties.
You may want to check out more software for Mac, such as Icon Creator - ICNS and IconSet Composer, Icon Set Creator or St. Valentine's Day Icon Set, which might be similar to Iconset.