IslandCraft is a Bukkit plugin which modifies the terrain generation to create an ocean with many islands.
BukkitDev: http://dev.bukkit.org/bukkit-plugins/islandcraft/
Sponge Forums: https://forums.spongepowered.org/t/wip-islandcraft-generates-and-ocean-filled-with-biome-themed-islands/11522
Wiki: https://github.com/hoqhuuep/IslandCraft/wiki
This is a fork from https://github.com/Craftstuebchen/IslandCraft, which is itself a fork from the original source available here: https://github.com/hoqhuuep/IslandCraft