Viewshape is described as 'Real 3d model viewer for Windows' and is an app. There are more than 10 alternatives to Viewshape for Windows, Mac, Linux and Android. The best Viewshape alternative is F3D, which is both free and Open Source. Other great apps like Viewshape are Netfabb, Materialise Magics, Free View Expert and 'topeScope.
STL Viewer can handle models with over one million facets, the response to pan, zoom, and rotate commands becomes progressively slower with increasing number of facets, even on high-end graphics hardware
OpenSTL A GUI-based STL (stereolithography) file viewer and editor. No installation needed. Support shaded/wireframe rendering and basic editings (translate/rotate)
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