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
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.
Assetforge - Asset Forge allows anyone to create 3D models and 2D sprites using building blocks.
Autodesk Maya - Maya is 3D computer animation software with powerful modeling, rendering, simulation, texturing, and animation tools for artists, modelers, and animators.