How to download and setup opengl-sandbox
Open terminal and run command
                                            git clone https://github.com/yumcyaWiz/opengl-sandbox.git
                                        
                                        git clone is used to create a copy or clone of opengl-sandbox 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 opengl-sandbox https://github.com/yumcyaWiz/opengl-sandbox/archive/master.zip
Or simply clone opengl-sandbox with SSH
                                            [email protected]:yumcyaWiz/opengl-sandbox.git                                    
                                    If you have some problems with opengl-sandbox
You may open issue on opengl-sandbox support forum (system) here: https://github.com/yumcyaWiz/opengl-sandbox/issuesSimilar to opengl-sandbox repositories
Here you may see opengl-sandbox alternatives and analogs
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