Bukkit

GriefPrevention-Anti-Worldedit

Allows moderators/admins to easily display IP addresses for users

TimeBomb

MCCowsay

Vertical velocity boosting pads.

Simple Mob Damage. Control mob damage with this lightweight plugin!

Hats

Server and Player Information

This plugin makes players ghosts when they die.

SignURLs

This plugin logs user's votes and displays them.

RealChop

A IRC Api to hook onto

Allows players to teleport only between specified team-members.

Who can kill most mobs?

Excursion

An API to help developers work with the new UUID system

UltimatePlug

Modify the Creative mode flying speed so you can travel

TnT goes insta-boom!