Icon Creator is described as 'Just drag your image file onto Icon Creator's app icon, and a new ICNS file will appear on your desktop'. There are eight alternatives to Icon Creator for a variety of platforms, including Windows, Online / Web-based, Mac, Linux and Windows Mobile. The best alternative is IcoFX. It's not free, so if you're looking for a free alternative, you could try Icons8 or EOS icons. Other great apps like Icon Creator are IconShock (Free Personal), Icon Generator (Free), IconXP (Paid) and X-Icon Editor (Free).
EOS icons is an Open Source iconic font and glyphs library that can be easily customized from the website, or downloaded as a font to use its ligatures. It includes over 1000 icons and some of the best features are.
Icon Generator is a little application built on AIR that lets you generate a CS5 or Web 2.0 style icon.Three versions are prepared according to the usage. You can use Windows XP/VISTA/7, Mac OS X, Linux. - Online - browser that can be used.