WowAce

Dynamic item DKP calculation

Track of your tradeskills across characters, create small buttons for them and track cooldowns.

A library to provide mobIDs for bosses.

Provides quick access to information on your group and their equipment, enchant and gem choices.

Fires events whenever a raid member "fails."

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

An auction house AddOn to make the life of each fence easier.

Shows Status Bars that you can drag around and group up for your cooldowns

Entertaining kill-shot notification.

Where the lore is at

CraftList2

Incoming Heals

Tracks, transmits and displays the cooldowns of your raid.

Provide plenty of links

Mutes various chat related annoyances while in capital cities and instances.

A simplistic clock.

TuiRaidTracker

Food/water macro generator

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

FuBar_AnkhTimerFu