WowAce

CombatLog in SimpleCombatlog style

Angry Boss Reminders helps raiders switch to the proper talents, glyphs, and gear for each boss during a raid.

A Data Broker display for combat statistics.

Heal and decurse by clicking on customizable raid/party unit frames

Acolyte2

Shows your standings with the factions.

For Developers (of Addons which uses LibWho-2.0): show queues and queries in realtime

Library supporting plug in filters.

A library for PvP and Battlegrounds

Make it easy to explain bosses in Raids.

Library to help with querying unit talents.

AltClick an item in your bag to add it a mail, auction, or trade frame, and alt-click to buy a stack if reagents.

RBM

CCBreaker

LittleTrouble

FuBar_FuXPFu

Adds two icon indicators to each corner (total: 8 icon indicators).

Reduces interface tedium by doing the little things for you.

Prospecting and Disenchanting Aide

Tracks skill and tradeskill costs and progressions, as well as trainer locations.