WowAce

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

Draws some lovely 3D portraits in the standard Blizzard artwork.

Waitlist addon with EPGP Mass Award hooking.

Adds Buff/Debuff icons to the grid frame.

A Data Broker add-on for quickly switching your specialization with gear set and loot specialization.

Needja Tracker

PartyToGo

Parkour puzzles throughout the world.

Provides the ability to suppress specific spellcasts like "Deaden" from your casting bars.

T_Tracking

OneChoice tries to help you reduce quest reward choices down to, ideally, one choice.

A helper addon for the achievements "Let It Snow", "Fistful of Love", "Shake Your Bunny-Maker", "Check Your Head", and "Turkey Lurkey"

SinkLib

Enhances the StackSplitFrame with numbered Buttons, a '1-Click Mode' and a 'Auto Split Mode'.

FuBar_AlarmClockFu

Constructs a SimC export string for an item without equipping it

Tells you which blob to kill at the Yor'sahj encounter in Dragon Soul.

Open those clams (and other containers)

Automatically sells low quality gray items and selected white items to the vendor.

Expo