Bukkit

Vault is a Economy/Permission plugin for hooking into the various Economy and Permission plugins.

A collection of useful commands and features for server admins and players.

Set up custom villager shopkeepers

EssentialsX

The best chest&sign shop system for Bukkit

Allows server admins to easily modify how Minecraft works without programming anything

Replicate first-person shooters with advanced gun-mechanics and a vast number of exciting and fully customisable features.

Another auction house plugin.

iConomy - Reloaded!

Unique and challenging custom achievements or quest-like objectives on your server! Books, fancy GUI, rankings, rewards, effects and more!

Commandless, Multi World, Player Owned Shops (Vault)

Jobs Reborn

QuickSell

The all in one Shop plugin, With a sexy GUI, Sleek code, and light weight performance!

Enchant any item with whatever you want, add lore to items, rename items too! UberEnchant has it all!

This allows players with permissons, to give other players points

LimitDrops

Lets you sell a players heads for half of their money

Adds Lotto, Loans, Stocks

Multiverse Inventories allows you to control who and what can cross world borders!