DAZ 3D - Daz 3D, 3D Models, 3D Animation, 3D Software
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.
Vroid - A free 3D character modeller
Sculptris - Sculptris: Enter a world of digital art without barriers.