Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Sculptris - Sculptris: Enter a world of digital art without barriers.
SelfCAD - SelfCAD is an online 3D modeling and slicing software.
ZBrush - ZBrush is a digital sculpting and painting software solution.
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.
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.