IconShop is an icon librarian that offers the tools to manage ICL icon libraries.

IconShop Features
Read and write ICL icon libraries.
Drag and drop files and folders from the Windows Explorer onto the IconShop window to process them.
Drag and drop icons or icon images between IconShop windows.
Extract icons from Windows icons, cursors, animated cursors, BMP bitmaps, GIF bitmaps, TIFF bitmaps, XPM bitmaps, resources, executables and libraries.
Extract icons from Macintosh icons, resources, executables, IconDropper icon packs and Kaleidoscope schemes, including MacOS 8.5 24-bit and MacOS X 32-bit icons.
Export icons to icon, cursor BMP or TIFF bitmap format.
Tiny executable size.