Ldraw.org
- A freeware program which can create Lego models in 3D. Learn about LDraw, download related software and latests parts updates.
- http://www.ldraw.org/
LeoCAD - A CAD program that uses bricks similar to those found in many toys. The program can import LDraw files. - http://www.leocad.org
BlockCAD - 3D fun drawing program uses Lego like blocks. Provides a gallery, downloads, and instructions. - http://web.telia.com/~u16122508/proglego.htm
LEGO CAD: Simple Machines - A computer-based educational LEGO building kit designed to teach concepts in basic machines. - http://www.workshop3d.com/cybertoys/legocad.htm