From MothCraft

SkyBlock is a fun sky island plugin accessable by /island and its basically your own realm. if you want it to be a challenge, challenge yourself and don't bring in outside materials.. if you want it to be your home and realm, use everything at your disposal. the scoreboards are turned off because its really more of a "realms" kind of thing. other players seem to like that. you can add your friends to the island as well so it then becomes their island as well! anyone can visit your island unless you close it.. you can even set the biome and have a nether island. There's even an ore generator if you use a cobble generator, it will give you iron, redstone, diamond ore.. etc!