ViewSTL is a free online STL viewer with advanced features. It's a browser-based tool, so need to install this software, just open your STL files directly in the Web browsers.
3Dvieweronline is also free for enthusiasts. It is one of the best online collaboration platforms for 3D models. It supports other 3D file format also.
The online 3D viewer is an Open source STL viewer. It also has some advanced features like Model measurements, Volume, Surface area calculator. It also supports other 3D file formats.
Autodesk viewer is tool provided by Autodesk. Autodesk viewer supports most 2D and 3D files, including DWG, STEP, DWF, RVT and Solidworks.
This is also a browser-based Free STL 3D viewer. JSCAD also provides a programmer’s approach to viewing and developing 3D models.
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