WowAce

Adds Name and Buyout Price sort columns to the auction house.

TweakHub module to automate various activities such as accepting resurects, invites, and other game dialogs, ignoring duels a...

"Range finder/display for Discipline's Holy Nova"

LDB addon to manage your addons

Will try to keep track of what a character did last time it was logged in

Pop a chatframe warning about guild battle standard when boss health reaches 30%

Shows the duration of the most recent (or current) combat

LFD status via a DataBroker display rather than the minimap.

Reports in raid chat whenever a raid member "fails." /EnsidiaFailsWotLK to configure.

Avion2

Echos quest objective completion to your party

Monitors the combatlog identifying players from the oposite faction near you.

oUF Layout

SimpleDrumAnnounce

FuBar_PvpFu

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

BangItHarder

Simple embeddable publish-subscribe implementation.

Draws 3D portraits for main units that can be moved or resized at will.

QuestLongList