A combination of familiar interface, powerful tools, native *.dwg format at no cost makes nanoCAD the perfect solution to all your design needs.
nanoCAD supports SHX, LIN, PAT,... and also VB Scripts & LISP!
nanoCAD includes all necessary tools required for basic design and allows creating and editing 2D and 3D vector objects.
Comparsion to AutoCAD: http://nanocad.com/page/Comparison