3D Builder - Download 3D files and edit them or build from scratch using simple shapes.
Installed by default on Windows 10. Can download app for Windows 8.1.
Autodesk - Free software for students and educators. Access the same design software and creativity apps used by industry professionals.
Blender - Free and open source 3D creation suite. It supports the entirety of the 3D pipeline—modeling, rigging, animation, simulation, rendering, compositing and motion tracking, even video editing and game creation.