WowAce

pMutilate

EnhancedLFG

Social tracking suite.

Warnings about tanking specific abilities

TalentWhisper

Fancy up the PlayerPowerBarAlt frame

Does a /who search of multiple dungeons.

Manages the scanning of the auction house in a reliable an efficient manner.

Cartographer_Stats

Keeps track of time played and rested XP across your characters.

BankItemsFu

Adds four icon indicators to Grid (top, bottom, left and right).

Bidder for DKP points. Usable as standalone bidder, or with DKP - Manager to manage points.

Displays the zone level ranage of the zone you are in and also gives you a suggest zone and instances to be in.

Lets you drag UI frames around

Simple oRA3 Maintank Target Frames, based on oUF

SmartyCat

GridAlert

A module that lets you find out what today's dailies are without having to visit the quest givers.

Visual Raid Cooldown Tracking