How to download and setup gz-sim
Open terminal and run command
                                            git clone https://github.com/gazebosim/gz-sim.git
                                        
                                        git clone is used to create a copy or clone of gz-sim 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 gz-sim https://github.com/gazebosim/gz-sim/archive/master.zip
Or simply clone gz-sim with SSH
                                            [email protected]:gazebosim/gz-sim.git                                    
                                    If you have some problems with gz-sim
You may open issue on gz-sim support forum (system) here: https://github.com/gazebosim/gz-sim/issuesSimilar to gz-sim repositories
Here you may see gz-sim alternatives and analogs
aws-doc-sdk-examples awesome-cpp infer spritejs openage ChakraCore OpenRCT2 openpose x64dbg cpr tinyrenderer finalcut MuseScore appleseed openauto hotspot awesome-quant arl vectiler yii2-render-many KaHIP Catch2 yuzu compiler-explorer scylladb rxterm vcpkg project-based-learning BackgroundMusic tangram