FreeCAD - An open-source parametric 3D modeler
VectorEngineer - VectorEngineer is a CAD software system that you can use to create technical 3D drawings.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Altair Inspire - Altair Inspire enables design engineers, product designers, and architects to create and investigate structurally efficient concepts quickly and easily.
Inventor - Inventor is a 3D CAD software that lets you quickly create 3D models with embedded intelligence, intuitive workflows, and optimized performance.
ANSYS SpaceClaim - SpaceClaim 3D Modeling Software Solves Geometry Problems Fast.