Bukkit

The multiworld plugin made by ferrybig

PlotSquared

Exotic Garden

A Skyblock Plugin

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

MagicLoot

Nothing but void!

Provides automated plots with protection (MultiWorld support)

A simple void world generator.

uSkyBlock

IslandWorld - Survive on small isle

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.

An Automated Hunger Games plugin!

This plugin allow full control of normal world generator

Its a plugin, but its mod-like: New mechanics, new worlds, custom bows and strucutres, faster game, survival reinvented.

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

A chunk pregeneration plugin for Spigot (and paper) servers.