Bukkit

The multiworld plugin made by ferrybig

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

PlotSquared

Nothing but void!

A Skyblock Plugin

Pre-generates chunks, quickly, efficiently, and safely

Provides automated plots with protection (MultiWorld support)

Exotic Garden

IslandWorld - Survive on small isle

A simple void world generator.

uSkyBlock

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

A plugin that makes your server lag free.

This plugin allow full control of normal world generator

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

An Automated Hunger Games plugin!

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

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