WowAce

A library for PvP and Battlegrounds

Role playing AddOn that shows extra information about characters as entered by the player.

Angry Raid Points Client

WF3sec

FuBar_OutfitterFu

SurgeonGeneral

NameTagToggle

Visual loot monitor

Shows skills in a tooltip and allow them to be used. Also keeps track of Cooldowns.

Gives detailed descriptions of particular localities, as zones or instances, and provides optional TomTom integration.

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

Short EPEEN

Provide plenty of links

Ignore more than 49 people, autoshared between your alts

A library to handle rearrangement of blizzard's frames when bars are added to the sides of the screen.

Tracks SendAddonMessage Spam

Scans your Equipment for cumulative item bonuses and sums them up.

Detox

Tracks vulnerability debuffs on multiple mobs

Adds your damage to Scrolling Combat Text