Bukkit

A simple to use and powerful plugin to create user interfaces.

Mine spawners with silk touch

Allows server admins to easily modify how Minecraft works without programming anything

Creates images and pixel-art using in-game blocks

**Not Maintained** Display an RPG-style health bar above mobs and players.

The best chest&sign shop system for Bukkit

Slimefun

Easily add commands to NPC's! [1.8-1.12] (BungeeCord Support | Citizens 2)

Grief Prevention

Addeds the Ability to play music from a custom resourcepack on a server, without overriding existing music

A simple and powerful backpack plugin with SQLite and MySQL storage.

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.

Claim land of any shape, not just within a chunk

An mcMMO themed plugin for horse role-playing.

Have minecraft read the chat to you

BackAgain

mcMMO

Limits amount of creater spawns via limits set by config

LimitDrops

Lets you sell a players heads for half of their money