Bukkit

Write plugins in JRuby

Interesting PVP game modes on temporary worlds. Has a variety of game options, and helps devs create their own game modes.

Create custom enchantments with custom effects !

Quick Binder by DemoNIKman

An API / Library plugin used to add you own plugins to an economy ecosystem.

Give Players Permanent Potion Effects Via One Command And Easy To Use Plugin!

A REST call client for Bukkit

Block all commands | AntiHacking | AntiGriefing

An easy to use API for developers to create complex dynamic GUIs

A library for easing the burden of developers when managing commands and listeners.

Plugin to enable staff to talk privately behind closed doors :3

The simple way to create highly configurable Runes.

Use a command, and single password to give yourself temporary OP.

Per world hardcore mode

ClsInv

Pesky users wanting op. Give them OPme

Easier creating Commands

View the inventory and armor of any mob with a GUI

Let the blocks drop that you mine in creative

Test your server to see if it is working!