WowAce

Automatically invites player from templates.

Tweak the tradeskill windows

SinkLib

Makes tracking reputation much simpler. By InSo(v)nIaX

NabuFiveSec

Modifies the inbox into a scrollable inbox, including open all options

FuBar_AbramsFu

Displays the time until the next battle and more.

Quest helping: fetching items to use, that sort of thing.

Allows frames to be dragged around, without permanently changing their position.

A fully featured library tracking all ongoing absorb effects

Displays a variety of useful stats for tanking

Simple oRA3 Maintank Target Frames, based on oUF

MobHealth

Does a /who search of multiple dungeons.

Lexan

Toolset for tanks, providing information on taunts and other valuable information.

Visual Raid Cooldown Tracking

FuBar_NinjutFu

Drops the least valuable item in your bags to make space.