ResKnife is a resource editor for the Mac OS. The project comprises numerous binaries, supporting 68k, Classic PPC, and Carbon/Cocoa. It supports dynamically loaded CFM or MachO plug-ins to edit resources, and is easily extendable by third parties.
Version 0.6b3: Release notes were unavailable when this listing was updated.
Tested on Mac OS X 10.4.4 but it should work on 10.2 or later