GEMDOS

GEMDOS is a Digital Research kit designed to assist the porting of GEM to 8086, 68K+ and VMS/10 systems. It contains everything necessary to get going, including, for the 68K, a compiler, an assembler, a linker, and lots of source code - all you need is an existing system (grin). I've made it available here since its been sitting on my bookshelves for years, and GEM is now released under the GNU General Public Licence.

A more recent version of GEMDOS can be found at http://www.mucl.de/~mdoering/atari/en/.