Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Zero Brush - blendersensei.com/zero-brush Texture painting, sculpting, and baking addon for Blender.
Sculptris - Sculptris: Enter a world of digital art without barriers.
Misfit Model 3D - Misfit Model 3D is a 3D model editor that basically operates with triangle-based models.
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.