Bukkit

Create custom scoreboards using variables.

Per user, per world highly configurable compass mechanics.

WebPortal

Teleport using buttons with price/reward/custom messages

A simple, highly customizable automessager.

edit all messages of your server

Death Messages

Inspect ender chest and inventory of players and entities.

McMMO Rank UP

A simple and easy to configure plugin that lets you announce to the server when a new player joins for the very first time.

CommandKit

Individual Signs Plus

Lets you check the server lag, in ticks-per-second

CommandOverride

Automatic Announcements

Allows signs to be edited with ease

Supports clients modded with VillageMarkerMod

Play Custom sounds when a player joins/leaves/talks/dies or respawns

A skills system for Bukkit!

RemoteBukkit allows admins to, with the help of a plugin, remotely use the server's console.