Bukkit

Make your own countries, states, and cities!

Big Ocean and new challenges

BuySigns plugin!

Gangs. (Newer version of factions, but with in built minigames)

[AI] The All Included Plugin!

iCoin

Trade with other players on your server with ease!

SMPCommands

Guillotine

PlayerJobs is a jobs plugin that allows all players to earn currency and experience points while playing Minecraft.

SimplyConomy

Kill other players for money and fame!