WowAce

Display Garrison missons for all Characters

Keeps track of your current location.

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

Show item durability and quality in the character frame.

Open those clams (and other containers)

Tankalyze

PvE Status Frames

FuBar_ItemListFu

Display Cooldown Count of Spell Icon and Item

Adds a button to undress the model in the Dressing room.

tracks and share quests between your party

Keeps track of quests.

MorgDKP

Prat

Shows your standings with the factions.

Incubator

Monitors for friendly deaths and announces them as in Myth: The Fallen Lords

Tells you if you're buffed

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

manipulate the minimap in numerous ways; move, scale, skin.