WowAce

Adds unreal tournament style sounds to PvP encounters.

Entertaining kill-shot notification.

EBB adds groups of bars to your screen showing you which (de)buffs currently affect your toon or some other units.

Display Cooldown Count of Spell Icon and Item

Automatically leaves the global channels when inside an instance/raid and restores them when exited.

Angry Assignments

Library to check whether an item is equipable / appropriate for a given class

An intuitive keybindings library.

Adirelle's bag addon.

XP bar using Ace3.

Improved Questing Experience

Blocks Chinese Chat

Add item levels to Inventorian

oUF element for highlighting debuffs that are dispellable by the player

Manages social information with a focus on main-alt associations.

Lightweight Chat Improvements

Library of compressed itemid sets.

Accelerates Camera Zooming

Hides MicroButton Alerts

Shows where the equipment of inspected users or yourself is from.