Viz4D - Viz4D helps you create top-performing web-based 3D viewer that works great on mobile and VR. It is tailored for real-time Archviz walkthrough, 3D product configurator and presentation.
FreeCAD - An open-source parametric 3D modeler
Sketchfab - Sketchfab is an industrial design software tool is useful for ideation and for beginners in the industrial design field.
SketchUp - 3D for Everyone
Sketchfab VR - Explore countless user creations from Sketchfab in virtual reality.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.