Blender - Blender is the open source, cross platform suite of tools for 3D creation.
ZBrush - ZBrush is a digital sculpting and painting software solution.
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.
DAZ 3D - Daz 3D, 3D Models, 3D Animation, 3D Software
meshmixer - meshmixer is an experimental 3D modeling tool for making 3D mashups without too much hassle.
Sketchfab - Sketchfab is an industrial design software tool is useful for ideation and for beginners in the industrial design field.