Bukkit

BukkitGUI - the most downloaded GUI for bukkit and any other server

Players in creative can 1-hit-kill mobs when crouching

Advanced /vanish plugin which makes other players think that you're not on the server

A plugin to warn your players when your server will restart!

Light weight and easy to use!

Expand the capabilities of Skript with skRayFall

Lockette v1.4 - Simple chest and door lock, no databases!

PowerRanks

Custom backpack items in vanilla Minecraft!

A fully customizable essentials plugin, to help your server appear as professional as possible!

Get custom items on join.

Schedule configurable server wide broadcasts easily

PlotSquared

All what you need for economy on your server. Money/Shops/Jobs/Towns

Votifier

Whose pet is this? Manage pets and display information via holograms, action bar or chat messages!

The banning plugin that does everything. Properly.

An addon to the popular addon Skript that exposes the Bukkit API to general server owners

FastAsyncWorldEdit

Add prefixes and suffixes with the 1.5 Scoreboards!