Bukkit

Spawns mobs on or near a player from anywhere on the server.

Allows the toggle ability for a player/admin to prevent item based events.

Plate Mines turns selected redstone activators into lethal weapons. Also regulates use of redstone on mobs and players.

Causes cows to explode when attacked.

A stats plugin to let players and server owners check stats in game or in the flat file.

Allows users to fly for X amount of time before it goes into a cooldown mode.

Sends user to a work camp until a set period of time or blocks obtained on random chance at death.

NoMobsOnMyPlate allows the server owner to decide what redstone devices a mob will no longer be allowed to interact with.