Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Microsoft 3D Builder - View, capture, personalize, and print 3D models.
FreeCAD - An open-source parametric 3D modeler
ArCADia-Architecture - ArCADia-Architecture is a revolutionary component for the instant creation of architectural documentation and object drawing.
Sculptris - Sculptris: Enter a world of digital art without barriers.
Vectorworks - Vectorworks 2D / 3D CAD and BIM software for Mac or Windows provides one flexible solution for your entire design process. Sketch, model, and present with the ultimate software from start to finish.