WowAce

Provides the the health and target of by an unit targeted mob (meant to be used for tanks).

Collects, analyzes and presents information about the virtual economy.

Displays friend notes in unit tooltips, at logon, and in /who results.

Fires events whenever a raid member "fails".

Provides extended aura status settings.

Persists collapsed state of headers across wow sessions.

Library to help with querying unit talents.

PlayerNotes

Shows who controls Wintergrasp and the time until the next battle.

TableTopLib

Captures chatframe Tradeskill Links for later reference in an easy to read format

Simple oRA3 Maintank Target Frames, based on oUF

Uses guild notes to add alts' main names to chat windows and other places

FuBar_PuntFu

Cartographer_Trainers

Good looking, smoothy and helpful nameplates

Configuration library

Displays a reliable cooldown timer for the Shaman Ascendance ability

MoBuffs

Facilitate better communication for loot councils