Bukkit

RpgEssentials

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

Floating island based world generation

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

Minecraft beta 1.7 terrain generator for bukkit.

SkyBukkit seamlessly brings SkyBlock to Bukkit servers.

A plugin to implements guilds and dungeons.

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

An epic Minecraft Bukkit world generator

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

An Automated Hunger Games plugin!

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

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

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

http://dev.bukkit.org/server-mods/infiniteplots/

Managing all the worlds. One at a time.

MagicLoot

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.

Generate world structures manually (villages, strongholds, temples, etc.)