Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Strata Design 3D CX - Strata Design 3D CX is a professional-level 3D modeling and animation software for Mac that delivers end-to-end power for the entire 3D design workflow.
SelfCAD - SelfCAD is an online 3D modeling and slicing software.
PathEngine - PathEngine is a middleware toolkit for the implementation of intelligent agent movement, built around and implementation of points-of-visibility pathfinding on 3D ground surfaces.
Metasequoia - Metasequoia is suitable for beginners, and for professional of 3D modeling and for users using other 3DCG professional software or 3D printer.
ZBrush - ZBrush is a digital sculpting and painting software solution.