WowAce

Battleground Timers in a HUD around the Blizzard BG status

Note + rep tracking for players, with guild data sharing.

Tracks whispers and conversations

Open all your mail

Open those clams (and other containers)

Aperture

Keeps track of space left in your bags.

Depot

ClosetGnome_Fishing

T_ItemInfo

Improved Quest Tracker

Tracks profession specific cooldowns and items across all your characters

RangeRecolor

Adds a couple of graph displays to Skada.

FuBar_SWStats2Fu

Collects, analyzes and presents information about the virtual economy.

Smooth group roll frames

LilSparky's Workshop mod for Trade Skills

Automatically generate and announce optimal spirit totem assignments during the Gara'jal encounter in Mogu'shan Vaults.

Profiler of the Lords of the Zodiac guild.