Computer Aided Design
Computer software and (sometimes) hardware used to design things. A CAD system might be as simple as a computerized drafting tool or as complex as a parametric mechanical constraint system, a routing and layout software for integrated electronic circuits, or an architectural program that knows about the physical and spatial properties of constructive elements in a building.
A parametric CAD system and development tool for engineering, computer aided design, and product modeling applications, with free download for Linux and Windows. http://www.tech.oru.se/cad/varkon/
