WowAce

Automatically turns on the combat log for selected instances

Numerical and graphical display of Combo Points and similar buffs/debuffs. Also tracks Holy Power and Soul Shards.

Unit frame addon using Ace3.

A library to provide unit-oriented tags to LibDogTag-3.0

A library to provide a markup syntax

XP bar using Ace3.

AutoMagicly clicks though Daily Quests, and Turns them In.

Shaman totem bar

Archaeology Assistant

Am I locked out? - Displays all RaidIDs for all chars

Improved Questing Experience

Database of Diminishing return categories and general data

Show the appearance of an item when you mouse over it

From bags we came, to bank we return

Keeps account of attendance and loot for raids, parties, bgs, arenas and solo for questing.

Checks Raid Buffs/Flasks/Consumables. Tunable alerts for misdirects, taunts, cc breakage, rez, dispel and interrupt

Display Cooldown Count of Spell Icon and Item

Provides one or many informational windows with optional interactive widgets.

Adds various information based on PeriodicTable to item tooltips.

Enables multi-line/unlimited-length pasting of text or commands into WoW