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

CS-CoreLib

Creates images and pixel-art using in-game blocks

Slimefun

Create user friendly menus to travel to worlds

Library for intercepting sent and receieved Minecraft packets.

An API for all of Zombie_Striker's plugins

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.

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.

Disguise as a mob or other player

Expand the capabilities of Skript with skRayFall

Massive Core

CoreProtect

Votifier