Bukkit

A built-in, HTTP-accesable web server within your Minecraft server.

A voting plugin

ControlAndInfo

Plugin: Administrator to server

CheeseCommands

With this plugin you can Global banning people over multiple servers!

A plugin that allows you to send players a fake OP message and a fake join message.

Provides free configuration , although it's made for begginers. Check this out.

Intro to prison server

A simple fix to recent sign exploits

Advanced muting plugin

Easily search for and install plugins from BukkitDev

Iper

BurnFinder plugin to discover on which coordinates a block burned down.

NeoScript [Spout]

Clear Player Chat

Log all Activities from Players and Server Side on both Bukkit and Proxy instances!

TLDs AgeChecker

Simple user and owner friendly shops

Fixes the current powered rails dupe exploit in Minecraft 1.1