SketchUp - 3D for Everyone
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.
Assetforge - Asset Forge allows anyone to create 3D models and 2D sprites using building blocks.
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.