You could have downloaded icon2icns 1.0 for Mac from our software library for free. The application's installation file is commonly found as icon2icns100.zip. Icon2icns for Mac lies within Theming Tools, more precisely Icons & cursors. The following version: 1.0 was the most frequently downloaded one by the program users. This free Mac application is a product of shinystat. This application's bundle is identified as com.ittpoi.icon2icns.
From the developer:
Create an ICNS file from that icon you just made, free. ICNS files store different sizes of icons, to make them look better at smaller sizes. Edit your icon down to 16x16, and put that in the smallest spot. This way, the computer switches to that icon rather than render a 128x128 icon down that small.
You may want to check out more Mac applications, such as LeopardDocks, Alert Expansion X or Shelf Leveler, which might be similar to icon2icns.