This is a list of the unix commands provided by BRL-CAD. In the spirit of unix there are over 400 commands that each do a single thing well and can be used together as you see fit.
mged -- multi-device geometry editor. Start here.
fence -- make a model of a fence
tire -- make a model of a tire
vegetation -- make a model of a tree.
rtshot -- pass a ray through a model to see what it hits.
Translators to BRL-CAD
Translators from BRL-CAD
g-vrml -- convert a .g file to vrml 2.0
g-stl -- convert a .g file to a .stl file