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