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