Inventor - Inventor is a 3D CAD software that lets you quickly create 3D models with embedded intelligence, intuitive workflows, and optimized performance.
FreeCAD - An open-source parametric 3D modeler
IronCAD - IronCAD is intuitive 3D CAD software that increases efficiency and can be used standalone or to complement an existing design environment.
SketchUp - 3D for Everyone
Ayam - Ayam is a free 3D modelling environment for the RenderMan interface, distributed under the BSD...
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.