Blender - Blender is the open source, cross platform suite of tools for 3D creation.
SolidWorks Composer - Easily repurpose existing 3D models to rapidly create and update high-quality graphical assets that are fully associated with your 3D design.
FreeCAD - An open-source parametric 3D modeler
Autodesk Fusion 360 - Integrated CAD, CAM, and CAE featuring collaborative editing and cloud-based computation.
Sculptris - Sculptris: Enter a world of digital art without barriers.
Inventor - Inventor is a 3D CAD software that lets you quickly create 3D models with embedded intelligence, intuitive workflows, and optimized performance.