Bukkit

Vote Send

ATM/Hole-In-The-Wall style signs for all major economies.

HeavenActivity gives income based on a user's activity and previous balance.

UpgradingCore

Simulated Item Market Shops

Allows Player to use Lures while fishing to get better loot than just fish.

This Plugin makes your chunks buyable!

Invite The World: Invite player for rewards

A plugin that allows you to get XP after harvesting a certain number of resources!

Buy items with XP!

it gives allows you to create mob spawners

Vote4Diamond is a plugin that allows users to vote on different voting sites and get diamonds (configurable) in return.

A plugin for settings up drop parties!

My personal edit

In game data base system using chest arrays

Lets you sell a players heads for half of their money

Adds Lotto, Loans, Stocks

Easy way to store your XP

Worldguard GUI, User can buy Regions and manage easily

Small plugin to enable the storage of experience points in an item.