The UDIG 1.0.1 SDK release is avaiable here:
- udig-1.0.1-src.win32.win32.x86.zip
- udig-1.0.1-src.linux.gtk.x86.zip
- udig-1.0.1-src.macosx.carbon.ppc.zip
If you are simply looking to run UDIG, please consider the normal UDIG 1.0.1 page, this download is meant explicitly for plugin developers.