http://www.magicnet.net/~toddmac/equinox.html
http://sunserver1.rz.uni-duesseldorf.de/~pannozzo/3ds.html
http://www.arch.unsw.edu.au/helpdesk/software/autocad/cadnotes/intro.htm
http://www.awa.com/nct/software/cadlead.html
http://web.arl.mil/software/brlcad/
http://www.cadmazing.com/cadmazing/
http://larch.lcs.mit.edu:8001/
http://www-cad.eecs.berkeley.edu/
http://akebono.stanford.edu/users/cad/synthesis/olympus.html
http://splat.baker.com/grand-unification-theory/eda/software.html
http://www.cadmazing.com/cadmazing/