Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Verge3D - Practical framework for creating 3D Web applications
SelfCAD - SelfCAD is an online 3D modeling and slicing software.
PlayCanvas - PlayCanvas is an open-source game engine built on WebGL and WebVR.
SketchUp - 3D for Everyone
Sketchfab - Sketchfab is an industrial design software tool is useful for ideation and for beginners in the industrial design field.