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