Gmsh - Gmsh is a 3D finite element grid generator with a build-in CAD engine and post-processor.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Altair - Visually Analyze Any Data at the Speed of Business
ZBrush - ZBrush is a digital sculpting and painting software solution.
NETGEN - NETGEN is an automatic 3d tetrahedral mesh generator.
Sculptris - Sculptris: Enter a world of digital art without barriers.