OpenSTL
                                The fastest and most intuitive library to manipulate STL files (stereolithography) for C++ and Python, header-only.
                            
                        How to download and setup OpenSTL
Open terminal and run command
                                            git clone https://github.com/Innoptech/OpenSTL.git
                                        
                                        git clone is used to create a copy or clone of OpenSTL repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with OpenSTL https://github.com/Innoptech/OpenSTL/archive/master.zip
Or simply clone OpenSTL with SSH
                                            [email protected]:Innoptech/OpenSTL.git                                    
                                    If you have some problems with OpenSTL
You may open issue on OpenSTL support forum (system) here: https://github.com/Innoptech/OpenSTL/issuesSimilar to OpenSTL repositories
Here you may see OpenSTL alternatives and analogs
spritejs tinyrenderer appleseed yii2-render-many tangram pixijs bgfx Texture rendertron webglstudio.js mapnik asm-dom rust-doom react-tv gg herebedragons Glitter phenomenon ScriptableRenderPipeline Nidium Intrinsic armory PdfViewPager ShaderGraph ogre two WickedEngine Game-Programmer-Study-Notes glumpy ascii_art