Bukkit

Pre-generates chunks, quickly, efficiently, and safely

A Skyblock Plugin

The multiworld plugin made by ferrybig

PlotSquared

CityWorld

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

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

This plugin allow full control of normal world generator

Exotic Garden

Adds many new items to the game - from OPItems to utilities

Nothing but void!

Creates Hunger Games styled arenas and gameplay

IslandWorld - Survive on small isle

Survive hordes of zombies as night stretches forever on

Floating island based world generation

Provides automated plots with protection (MultiWorld support)

A plugin for Bukkit based Minecraft server that adds a floating island dimension similar to the old skylands.

for use with InfinitePlots and WorldGuard, creates regions automatically for new players

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

uSkyBlock