Bukkit

PotionPusher lets you take any potion and change it's effects.

Create chest shops that trade in physical currencies.

Unified way to extend plot / claim limit on popular protection plugins.

Save inventory and experience on death, implement death taxes, etc.

Get a reward for killing the EnderDragon!

DivinityEconomy is a revolutionary Minecraft global dynamic command-based economy plugin.

A Single-Sign method for allowing players to sell items to the server.

This plugin let players buy permissions/commands/timepermissions etc. with items

Use golden tools to "smelt" certain block you are trying to mine/destroy.

Highway

CashControl

Yet a simple but powerful way to set the economic equilibrium in your bukkit server: competitive auction houses.

MoneySQL

MonsterDrop

GlobalShop

Add lootable chests to your ruins!

AShops is a new Bukkit server plugin that allows players to sell and buy items with a chest.

Dont punish your players, reward them, for not creating mob grinders

MultiEco

Manage your books in minecraft.