Julia, RIM, MAPGEN, GCTP, pbmplus and xgen are free ... and, they can be downloaded from the CERL server (moon.cecer.army.mil) under the /grass/grass4.1/release/related directory. You'll need to pull down the archived files 'related.cpio.Z.00**', unpack them and you should be all set. Later, Shane amante at grouse.pnl.gov