Skyland

[NiLSPACE]

You download this plugin to the plugins folder and add it to the settings.ini in the plugins section. In the FloatingIsland's folder there is a config.cfg. You open that. To add/change a world you add/change these lines:

["<WorldName>"] =
{
   Generator = "FloatingIslands",
   AdditionalFinishers = "Trees",
},

Change <WorldName> with the world that you want to be a floating island world. There is an example there by default.
You also have to disable the default Trees finisher in the world.ini, since it isn't compatible with a custom world generator.