Daemon
                                The Dæmon game engine. With some bits of ioq3 and XreaL.
                            
                        How to download and setup Daemon
Open terminal and run command
                                            git clone https://github.com/DaemonEngine/Daemon.git
                                        
                                        git clone is used to create a copy or clone of Daemon 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 Daemon https://github.com/DaemonEngine/Daemon/archive/master.zip
Or simply clone Daemon with SSH
                                            [email protected]:DaemonEngine/Daemon.git                                    
                                    If you have some problems with Daemon
You may open issue on Daemon support forum (system) here: https://github.com/DaemonEngine/Daemon/issuesSimilar to Daemon repositories
Here you may see Daemon alternatives and analogs
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