Currency
mt-mods

Provides shops, barter tables, safes, and multiple denominations of currency, called "Minegeld". Originally written by Dan Duncombe, but maintained by me.

Smart Shop
AiTechEye

Smart and easy shop

Server Shops
AntumDeluge

Shops intended to be set up by server administrators.

Traders
Sokomine

Configurable mobs/NPC which can trade for you.

Commodity market
FaceDeer

Provides API support for various in-world commodity markets

BitChange
Krock

Money items for your world, based on Bitcoins

Apartment
Sokomine

Rent an apartment with your own chests and furnaces close to spawn

Easy Vending Machines
Wuzzy

Adds vending and depositing machines which allow to buy and sell items from other players, using a currency item.

money3
luk3yx

Adds /money.

Jean's Economy
Jean3219

Full Economy for Servers like, paying, individual bank statemants, daily rewards, easy api for modders, easy integration with other mods ...

City CommodityMarket
X5Dragonfire

Adds simple CommodityMarkets for city's towns etc.

Item exchange shop
Krock

Provides a simple exchange shop (currency compatible)

Online Shopping
LC Creations

Allows players to buy and trade anywhere.

Boosts
activivan

Adds boosts, technically temporarily granted privileges.

Minercantile
Mathias

Economy featuring a primitive supply and demand system for exchanging goods.

Smart Renting
AiTechEye

Smart renting: Rent out your locked things and earn money!

Red Pockets
1F616EMO

Happy Chinese New Year! Give artificial red pockets to kids!

Joke Currency
chaosomnium

Adds a joke economy in game with controllable inflation and deflation.