Bukkit

Run scripts on triggers such as Walk, Click, PlayerDeath, Respawn, BlockBreak & many others. Use Object Variables, IF & ELSE.

Simple block/mob/player drop editing - ultimate customization!

Seeing light in your darkest hour

CraftBook adds a number of original gameplay elements to Minecraft from integrated circuits to gates

Every Message Under Your Control!

Pick jobs earn money!

Provides configurable options for changing damage/health for entities on your server based on Level

The all in one Shop plugin, With a sexy GUI, Sleek code, and light weight performance!

Give unique powers to players

Creates Hunger Games styled arenas and gameplay

A fully customizable and open-source DayZ/MineZ post-apocalyptic Minecraft plugin.

Thirst

Scriptable, interactive citizens.

[UNMAINTAINED] Display an RPG-style health bar above mobs and players.

An extensive questing system

Vampire

Brew alcoholic potions, get drunk and have fun!

The most advanced free RPG Skills & Leveling plugin

Adds many new items to the game - from OPItems to utilities

Allows you to trade with players using the Villager GUI.