Blender - Blender is the open source, cross platform suite of tools for 3D creation.
DAZ 3D - Daz 3D, 3D Models, 3D Animation, 3D Software
open3mod - A free, Open-Source 3D Viewer designed to make it all easier. Massive 3D Format support
cmftStudio - GUI counterpart of cmft - cross-platform open-source cubemap filtering tool.
MakeHuman - MakeHuman is a free, open source, interactive modeling tool for creating custom 3D human characters.
Sketchfab - Sketchfab is an industrial design software tool is useful for ideation and for beginners in the industrial design field.