How to download and setup ExtraPlanets
Open terminal and run command
                                            git clone https://github.com/MJRLegends/ExtraPlanets.git
                                        
                                        git clone is used to create a copy or clone of ExtraPlanets 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 ExtraPlanets https://github.com/MJRLegends/ExtraPlanets/archive/master.zip
Or simply clone ExtraPlanets with SSH
                                            [email protected]:MJRLegends/ExtraPlanets.git                                    
                                    If you have some problems with ExtraPlanets
You may open issue on ExtraPlanets support forum (system) here: https://github.com/MJRLegends/ExtraPlanets/issuesSimilar to ExtraPlanets repositories
Here you may see ExtraPlanets alternatives and analogs
OpenComputers mcu-curriculum crouton mcstatus WorldEdit SpongeForge SpongeAPI cuberite MinecraftForge LumixEngine gocraft PocketMine-MP BuildCraft hematite Glowstone Equivalent-Exchange-3 Nukkit Launcher pxt Genisys PHP-Minecraft-Query Paper PufferPanel nova-renderer entt DragonProxy Railcraft MinecraftDev Launcher pyCraft