Blender - Blender is the open source, cross platform suite of tools for 3D creation.
MakeHuman - MakeHuman is a free, open source, interactive modeling tool for creating custom 3D human characters.
ZBrush - ZBrush is a digital sculpting and painting software solution.
Aartform Curvy 3D - Aartform Curvy 3D is an easy and fast sculpting program for Windows.
Sculptris - Sculptris: Enter a world of digital art without barriers.
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.