IcoFX - IcoFX is an all-in-one solution for icon creation, extraction and editing.
JDraw - Open Source SF.net
VistaCreate - The VistaCreate is a free and global digital platform which is known for sharing, searching, finding, and creating great art.
IconsExtract - Extract icons and cursors stored in EXE, DLL, OCX, CPL files
Aseprite - Aseprite is an art program dedicated to the creation of pixel art.
RealWorld Icon Editor - Create Windows icons and Mac OS icons from images and 3D models in an integrated icon maker.