Bukkit

The multiworld plugin made by ferrybig

PlotSquared

Creates cleanroom-style flat world generator with fully customizable layers. It can also be used to create empty space maps!

Nothing but void!

A Skyblock Plugin

Provides automated plots with protection (MultiWorld support)

uSkyBlock

IslandWorld - Survive on small isle

A simple void world generator.

Exotic Garden

Create massive trees in Minecraft! Choose your own sizes and block types!

This plugin allow full control of normal world generator

An Automated Hunger Games plugin!

Completely overhauls the End dimension with new biomes, structures, bosses and more!

This is a basic world generator that creates empty worlds. It's lightweight, easy to use, and very basic.

Pre-generates chunks, quickly, efficiently, and safely

IslandCraft modifies the terrain generation to create an ocean with many islands; each island is a single biome.

OrePlus

An epic Minecraft Bukkit world generator

Don't let your players enter a world (forever or temporarly) if they die in it.