Horde by Sam_Lex

Bukkit Plugin

Provides a highly configurable extra creature spawner with per world settings.

Options include:
	*The selection of how strict the spawns should be in terms of where they are
	*The selection of how often the spawns happen
	*The selection of maximum and minimum distances for the spawns
	*Configurable messages to be sent to the server or/and the server on a Horde attack
	*The selection of which mobs can be spawned
	*The option of randomness
	*And much more
	
See http://dev.bukkit.org/server-mods/horde/ for details