Joel Orr's World of Technology: News and articles about CAD, plus books, humor, educational resources and relevant links.
PowerCAD: CAD program in 2D/3D for architectural and mechanical applications, with AutoCAD compatibility features.
Touch-3D: 3D modeling, unfolding and unwrapping program for Macintosh and Windows, and free-form add-on MCnurbs Creator for VectorWorks and MiniCad.
VARKON: A parametric CAD system and development tool for engineering, computer aided design, and product modeling applications, with free download for Linux and Windows.
solidThinking: Modelling software that supports NURBS, polygonal modeling, and subdivision surfaces, available for Windows and Macintosh.