Blender - Blender is the open source, cross platform suite of tools for 3D creation.
FreeCAD - An open-source parametric 3D modeler
Autodesk 3DS Max - 3ds Max is software for 3D modeling, animation, rendering, and visualization. Create stunning game enrivonments, design visualizations, and virtual reality experiences.
Sculptris - Sculptris: Enter a world of digital art without barriers.
ZBrush - ZBrush is a digital sculpting and painting software solution.
meshmixer - meshmixer is an experimental 3D modeling tool for making 3D mashups without too much hassle.