Blender - Blender is the open source, cross platform suite of tools for 3D creation.
SketchUp - 3D for Everyone
Autodesk 3DS Max - 3ds Max is software for 3D modeling, animation, rendering, and visualization. Create stunning game enrivonments, design visualizations, and virtual reality experiences.
Assetforge - Asset Forge allows anyone to create 3D models and 2D sprites using building blocks.
ZBrush - ZBrush is a digital sculpting and painting software solution.
FreeCAD - An open-source parametric 3D modeler