IcoFX - IcoFX is an all-in-one solution for icon creation, extraction and editing.
icon sushi - @icon sushi is icon converter that supports xp icons, vista icons, bmp, png, psd, exe and icl.
IconLover - Icon editor for Windows.
JDraw - Open Source SF.net
icoworks - .ico editor for Windows 8 and Windows RT
RealWorld Icon Editor - Create Windows icons and Mac OS icons from images and 3D models in an integrated icon maker.