In the last decade CAD software has revolutionized the design industry. Programs like Autodesk's AutoCAD have made drafting tables as irrelevant as slide rules for most designers. The following sites represent some of the leaders of this design revolution.

Autodesk.
Autodesk produces AutoCad and many other important CAD applications.

Intergraph.
Intergraph's Microstation is a widely used cross-platform CAD package.

UGSolutions.com
Unigraphics makes CAD software for aerodynamic design and engine efficiency.

3D CAD Architectural Modeling.
A required tool for architects and architectural students.

Introduction to AutoCAD.
These notes outline the general characteristics of the PC-based drafting system known as AutoCAD.