Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Sculptris - Sculptris: Enter a world of digital art without barriers.
ZBrush - ZBrush is a digital sculpting and painting software solution.
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.