WowAce

Notifies you of new calendar event invites and reminds of upcoming events on all characters and realms

A library that tells wether a item is a quest item or not (equipped or in bags)

Shift-clicking on a user name in chat shows a tooltip with their whois information.

RuinBossTactics

Cartographer_Stats

SmartQueue

BigWigs_ThogarLaneColors

Complete Replacement for Inventory and Bank Bags.

MAcon

Data broker for keeping track of your Ankh cooldown.

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

BigWigs_TabletBars

Adds AFK status to Grid frames.

AnchorsAway

Assistace for Blackhand (Mortar warning in P2, custom says for bombs and marks in P3)

BagPress

FuBar_ToFu

Omniscience

FuBar_PetFu

SwapMagic