WowAce

Set and manage character notes that are displayed in unit tooltips and /who results.

Shows you a much bigger icon selection frame

Changes the look of the default UI

Drop the cheapest thing you're carrying

LiteStep skins for Masque.

HideTalkingHead

A library to determine estimated range.

OneBag is a replacement for the default game bags that combines all the bags into one frame.

Automatically enables or disables combat logging based on location.

Enhances the default AddOns list.

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

Replaces the normal unit, party, target, pet frames and adds target-of-target.

Gears skins for Masque.

A lightweight, flexible, multi-target threat meter.

Libra

LibItemInfo-1.0

In-game theorycraft. Calculates actual damage/healing based on gear, talents and buffs.

Library that tracks incoming heals

Display Cooldown Count of Spell Icon and Item

Smooth combat HUD based on ArcHUD2