WowAce

Right-click on minimap blips to open a targeting menu (out of combat).

FruityLoots

CharScanner scans Basic Character Data, Talent Specifications, Equipment, PvE/PvP Achievements, PvE Boss Kill Statistics and ...

Displays a variety of useful stats for tanking

Suppresses chat messages from damage meters and provides single chat-link damage statistics in a popup.

A simple addon that warns you if your pet isn't attacking while you're in combat.

Quest information

Adds a simple percentage threat status to Grid.

Pet Theory

A library to try to guess a level of a player.

Reports the total threat on a mob at the end of combat.

CharacterInfoStorage

A collection management library similar to .NET's System.Linq

Create reagents easily

FuBar_GCInFu

Adds 3 indicators to each side (top, bottom, left and right).

aX_RaidStatus

PiraPlex

API for AceConfig-3.0

XML import library