Bukkit

Trade

a PvP Bounty mercanary system

Free donation alternative

ExchangeMarket lets players post buy and sell orders to be matched by other players.

qQuests - The simplest yet most customizable questing plugin since uQuest!

Create hotels and rent out rooms to other players

EasyShops2.0 is a plugin that allows tha players to create very customizable shops easily

ItemFrame Shop for Minecraft.

Allows players to get spawn eggs by throwing regular eggs at mobs.

Very simple-to-use shop system : deal materials stored in chests without commands / signs

Take money from other players and mobs upon death

easily create shops for physical economies.

give score to each other's building

Saga is a combination of settlement, faction and role-playing mechanics rolled into one.

Kill a player to steal one of their hearths.

Add some extra complexity to your mining experience by adding mining levels!

HitBox

ItemSlotMachine

This allows players with permissons, to give other players points

Play Team Foreress 2 right inside of Minecraft!