MinecraftPlugins is a project mainly written in Java, it's free.
A collection of RPG-centric plugins for the hMod minecraft server.
RPG
This is a framework for the hMod minecraft server that will enable RPG-like functionality in your game.
RPG REQUIRES MYSQL
The basic RPG plugin has little functionality, it is meant to be a plugin framework itself. Currently, RPG tracks each player's login times. The only built-in command available is /rpg players, which lists all players in the system, and the last time they were logged in.
RPGMagic plugin
RPGMagic is a command-shortcut system. Commands such as "/time day" can be made into "spells", with a name, description, casting cost, etc. Eventually this will be incorporated into an experience/levelling system, but for now RPGMagic is basically a glorified macro system.
RPGSpells plugin
RPGSpells is a collection of spells taken from MagicSpells and MagicTricks and made to work "better" or more directly within the RPG framework.