WowAce

Adirelle's unit frames, based on haste's oUF.

Food/water macro generator

Sheppard

Modular and lightweight party/raid frames.

Shows simple Buttons for your Cooldowns :)

Track all threat redirection ability transfers and cooldowns (Misdirection and Tricks of the Trade).

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

Queing of /who and SendWho() queries and a much better interface (see docs), with gurantee to be executed & callback.

Keeps track of your top hits, heals, criticals, etc.

QuestLog

Sphere

FuBar_AnkhTimerFu

Cartographer_Routes

One large inventory.

Open inventory items with 1 button

FlexBar2

A Friend-Enemy-Unit-Frame for battlegrounds.

TomTom CrazyArrow pointing to the targeted group member

Keeps account of attendance and loot for raids, parties, bgs, arenas and solo for questing.

Displays the locations of the chests for the Treasure, Treasure Everywhere achievement