Blender - Blender is the open source, cross platform suite of tools for 3D creation.
ZBrush - ZBrush is a digital sculpting and painting software solution.
Sculptris - Sculptris: Enter a world of digital art without barriers.
MODO - Modo by Foundry brings you the next generation of 3D modeling, texturing and rendering tools in a powerful integrated software package.
Misfit Model 3D - Misfit Model 3D is a 3D model editor that basically operates with triangle-based models.
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.