FreeCAD - An open-source parametric 3D modeler
Inventor - Inventor is a 3D CAD software that lets you quickly create 3D models with embedded intelligence, intuitive workflows, and optimized performance.
SketchUp - 3D for Everyone
IronCAD - IronCAD is intuitive 3D CAD software that increases efficiency and can be used standalone or to complement an existing design environment.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
3DSimED - 3DSimED is a Windows DirectX application allowing the creation and visualization of models from...