Bukkit

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

Arena fights for solo players or teams. API for creating simple events

PerWorldPlugins allows plugins to be set to hook onto certain worlds using the config.

The Great Weather Plugin !

Teleports you to a random location every time. Never the same place as last time

RaspberryJuice

Websend

Unseful commands.

OfflineManager - Manage offline players with commands!

Make any recipes through GUI's only - the only plugin that supports itemmeta, like enchantments - The most powerful crafting plugin.

The Ultimative Administrationplugin to update and manage Bukkit and its Plugins

API for changing player nametags

Extend Minecraft using Javascript

Create custom recipes Crafting Tables, Furnaces, Smithing Tables, and more. Support for NBT and more

Better command management !

EnchantmentAPI enables simple custom enchantment creation that behave like any vanilla enchantments!

MachinaCraft

Contains permission, math, trig, world, entity, block, scheduler, reflection and more utilities

A complete match and event framework for creating arenas and minigames in Minecraft. Supports creating modes through config files, or fully custom modes through plugins.

Add Commands to your Citizens 2 NPC!