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!

A Skyblock Plugin

Nothing but void!

uSkyBlock

Provides automated plots with protection (MultiWorld support)

IslandWorld - Survive on small isle

A simple void world generator.

This plugin allow full control of normal world generator

Exotic Garden

An Automated Hunger Games plugin!

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

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

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

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.

Survival in a sea of acid - like skyblock but with boats!

OrePlus

An epic Minecraft Bukkit world generator