open3mod - A free, Open-Source 3D Viewer designed to make it all easier. Massive 3D Format support
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Autodesk FBX Review - FBX Review is a lightweight, standalone software tool for viewing 3D assets and baked animations...
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.
Sketchfab - Sketchfab is an industrial design software tool is useful for ideation and for beginners in the industrial design field.