ConvertIcon! - Converticon is a simple icon utility.
Icon Editor by RedKetchup - View and edit Windows icons (ICO files) directly from the browser. Create icons in 8-bit, 24-bit, or 32-bit color depth. Extract all the layers of an ICO file as PNG images.
GenFavicon - Generator Favicon.
IcoFX - IcoFX is an all-in-one solution for icon creation, extraction and editing.
Ordinatore - Those who want to tidy up their Macs will surely love this application.
IconWorkshop - Application to create and manage software icons. A must for developers.