See the GRASS AUTHORS file for a listing of the many contributors to GRASS.  

libgrass has been adapted from the GRASS source tree by:

Frank Warmerdam <warmerda@home.com>
Bernhard Reiter <bernhard@intevation.de>

Also contributing:

Markus Neteler <neteler@geog.uni-hannover.de>
Roger Bivand <rsb@reclus.nhh.no>

And most importantly the financial support of ImageLinks Inc
( http://www.imagelinks.com/ ) as part of the OSSIM/GRASS Bridge project
( http://www.ossim.org/ ).