WowAce

Keeps track of current money and all your characters on one realm.

Sorts the Wardrobe

Add item levels to Inventorian

Displays Pet Info for Hunters and Warlocks. Also keeps track of Stables and Pet and Demon skills.

CandyBar style cooldown display

UnitActionBars

A Collection of Automations and Interface Tweaks.

Switch macro depending on zones or BigWigs boss modules.

FuBar_InnboundFu

Smart raid loot and DKP tracker with automated standby and learning

Tracking and ranking of dps/hps in a guild.

Incubator

Provides quick access to information on your group and their equipment, enchant and gem choices.

Shows class colors on player nameplates and names

A library to help with localization of Zones.

provides enchanters with a decent tool for managing their profession

Modular and lightweight party/raid frames.

Shows skills in a tooltip and allows them to be used.

Adds unreal tournament style sounds to PvP encounters.

Mutt (Macro Update Target Tool) provides slash-commands that can patch the predefined targets in your macros.