Yes-uQuest - A simple, overly customizable quest system.
Yes-Turnstile - Create turnstiles to prevent players from entering certain locations without paying.
No-DungeonReward - Reward players with money for reaching a certain region of the world.
No-PhatLoots - Players can open linked chests and be rewarded with money.
Yes-RealShop - A very simple-to-use shop system to deal materials stored in chests
Yes-TradeMod - A simple plugin allowing players to trade items.
Yes-WolfPound - Allows users to buy wolves, or get them for free.
No-Money2XP - Train your mcMMO skills using money.
Yes-Blacksmith - Lets you repair your tools with money.
Yes, but is open to abuseBuyAbilities - Allows players to purchase abilities or permissions with money.
need more info on ths oneChallenges - Admins can start server challenges for players to beat.
Yes-iConomyChestShop - Turn a chest into a shop by simply placing a sign over it. ( my 1fav )
need more info on ths oneCommandSigns - Charge for the use of commands from a sign.
Yes- Showcase - A unique shop plugin letting you show what your selling. ( my 2fav )