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.
Five years ago we partnered with Binkies 3D to bring you 3D models of the most popular smartphones, then a couple of years ago the 3D viewer gained a side-by-side comparison mode that allows you to ...