OpenSTL is described as 'A GUI-based STL (stereolithography) file viewer and editor. No installation needed. Support shaded/wireframe rendering and basic editings (translate/rotate)' and is an app. There are more than 10 alternatives to OpenSTL for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best OpenSTL alternative is F3D, which is both free and Open Source. Other great apps like OpenSTL are MiniMagics, Netfabb, Materialise Magics and Viewshape.
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
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