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.
3D-Coat - 3D-Coat is the one application that has all the tools you need to take your 3D idea from a block of digital clay all the way to a production ready, fully textured organic or hard surface model.
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.
Sketchfab - Sketchfab is an industrial design software tool is useful for ideation and for beginners in the industrial design field.