Blender - Blender is the open source, cross platform suite of tools for 3D creation.
FreeCAD - An open-source parametric 3D modeler
ZBrush - ZBrush is a digital sculpting and painting software solution.
SketchUp - 3D for Everyone
DAZ 3D - Daz 3D, 3D Models, 3D Animation, 3D Software
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.