WowAce

Cryolysis 2

A simple slash-command-based addon for querying item information from the Blizzard servers via ItemIDs and SpellIDs.

One large inventory.

Regain that wasted space!

A library to help with localization of in-game subzone names.

Displays the remaing cooldown of the action you tried to use

Alternate Power- and Combopoint/SoulShard/HolyPower-bar

Cleans up minimap buttons and makes them accessible through a pop out menu!

Keeps track of HoTs, DoTs, Buffs and Cooldowns. With audio and text alerts to refresh them.

Collects Herbs, Mines, Gas Clouds and Fishing locations and adds them to the worldmap and minimap

Displays the locations of the chests for the Treasure, Treasure Everywhere achievement

Track all threat redirection ability transfers and cooldowns (Misdirection and Tricks of the Trade).

FlexBar2

Compact rune and proc display for Death Knights.

Where the lore is at

Displays online friends.

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

Tracks vulnerability debuffs on multiple mobs

FuBar_HonorFu

Provides one or many informational windows with optional interactive widgets.