Bukkit

A World-Generation Plugin that creates and manages space worlds.

Floating island based world generation

A hunger games server mod designed for use with the Hunger Games Map Generator.

SkyBukkit seamlessly brings SkyBlock to Bukkit servers.

An Automated Hunger Games plugin!

Nothing but void!

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

RpgEssentials

Minecraft beta 1.7 terrain generator for bukkit.

An epic Minecraft Bukkit world generator

Create templeworlds that can be instanced and played by your players. Perfect for Adventure maps!

Giant Caves is a bukkit mod that creates giant underground caves in the world.

Some banks for your server (Economy Banks, Lottery, Shops, Save items and more).

1.5.1 compatible SkyGrid mod based off of SethBling's idea.

Infinite Floating Island Generator

Plugin based on Quijx map, which includes some improvements !

Double the depth of your world

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

A world modification plugin for Magic

Start on a single chunk, and build to be the biggest you can be.