Bukkit

Vault is a Economy/Permission plugin for hooking into the various Economy and Permission plugins.

PermissionsEx

Create modern-looking holograms in Minecraft.

Plugin Manager For Bukkit

Creates images and pixel-art using in-game blocks

CS-CoreLib

Slimefun

Create user friendly menus to travel to worlds

Library for intercepting sent and receieved Minecraft packets.

Fully customize any mobs (and create custom mobs) with a powerful scripting skill system, attributes, equipment, special AI, and much more, along with custom spawners and spawning rules. The ultimate plugin for making RPG servers and minigames.

An API for all of Zombie_Striker's plugins

Disguise as a mob or other player

CoreProtect

A Simple way of creating worlds for LobbyAPI

A Simple way of adding Bungee Servers for LobbyAPI

This is an Addition to LobbyAPI which allows the menu to show the world "world"

A bukkit plugin for adding neural networks into minecraft.

Expand the capabilities of Skript with skRayFall

Massive Core

Votifier