Zero Brush - blendersensei.com/zero-brush Texture painting, sculpting, and baking addon for Blender.

Blender - Blender is the open source, cross platform suite of tools for 3D creation.

Sculptris - Sculptris: Enter a world of digital art without barriers.

Quixel Mixer - Mixer is a PBR creation suite that uses brushes and non-destructive layering to generate all types of maps.

Sketchfab - Sketchfab is an industrial design software tool is useful for ideation and for beginners in the industrial design field.

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.