WowAce

Square Minimap and more

Helps you decide which ability to use next according to priority you set

Enables the filtering of items when you visit a vendor

WF3sec

Allows you to browse your clients database

Quest library for mob location and other information

Captures chatframe Tradeskill Links for later reference in an easy to read format

Raid Cooldowns

Shared handling of media data (fonts, sounds, textures, ...) between addons.

Shows a nice Soulstone Monitor.

Numen

HiveMind

Creates a broker plugin for all your broker launchers

SmartQueue

Allows the user to customize the the tooltip with lua-scripts

Mark My Words

WQA helps you find world quest groups easily. Works after the 4/28 group finder changes.

DotDotDot

Shows the minimum durability of equipped items on the stats frame.

FuBar_KTMFu