This post lists down the best free 3D File Viewer software for Windows 11/10 to view and analyze 3D models & STL, etc, files.

Free online 3D model viewer for GLB and GLTF files. Advanced WebGL rendering with PBR materials, custom lighting, and post-processing effects. View 3D models instantly in your browser.

eDrawings/Dassault provide the free eDrawingsViewer to enable viewing of 3D models (typically .sldasm/.sldprt, step/.stp or .iges) without requiring the expensive authoring apps such as SolidWorks ...