IcoFX - IcoFX is an all-in-one solution for icon creation, extraction and editing.
RealWorld Icon Editor - Create Windows icons and Mac OS icons from images and 3D models in an integrated icon maker.
JDraw - Open Source SF.net
IconLover - Icon editor for Windows.
IconsExtract - Extract icons and cursors stored in EXE, DLL, OCX, CPL files
icoworks - .ico editor for Windows 8 and Windows RT