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.
FreeCAD - An open-source parametric 3D modeler
ANSYS SpaceClaim - SpaceClaim 3D Modeling Software Solves Geometry Problems Fast.
Sculptris - Sculptris: Enter a world of digital art without barriers.
ArtiosCAD - ArtiosCAD is a specialized software developed by Esko.