Bukkit

Fully customize any mobs (and create custom mobs) with a powerful scripting skill system, attributes, equipment, special AI, and much more, along with custom spawners and spawning rules. The ultimate plugin for making RPG servers and minigames.

A mythical library for mythical plugins

Allows you to create graveyards where players will spawn upon death

Adds customizable days to your server based on the 8 Minecraft moon phases.