Bukkit

Horse Racing Plus

Destroy The Nexus

A plugin to launch huge fireworks and also single rockets

Launches a firework above a connecting/disconnecting players head.

Alternate leveling system

Soup PvP Plugin instant soup!

RandomEncounters adds configurable random structure, treasure, and mob generation to the world

Speeds up Boats

The best DayZ plugin!

Allows people to fly on their faction's land

Sheath swords with /sheath they are visible on your character!

Kindom Hearts And Final Fantasy Skills (fira, cura, etc.)

Move almost any block and change the range of pistons!

Drive minecarts like you drive trains in MicrosoftTrainSimulator, TrainZ or Railworks.

The definitive kit plugin for CraftBukkit

a plugin version of ArsMagica

Adds features for admins through a GUI for Admins use Only.

It's Magic

Virtual Bag

Animal Plague lets you configure a disease that will spread, weaken, and kill animals. Fun stuff!