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