WowAce

What did you just loot?

Litmus

Allows for gold tracking across multiple time frames

Death reports

HunterAEP

Provides data about all artifacts in the player's possession.

"Your quest log is full". How many quests do you have in your log?

Heads Up Display with Player and Target Info

Speeds up triggering actions such as items or spells by triggering them on key/mouse down rather than release

CCBreaker

Cartographer_Mining

Shows activity for hidden ChatFrames by making their tabs flash.

Buffalo

Utility library with shared functions and data for various addons by NeoTron.

A fully featured library tracking all ongoing absorb effects

CraftList2

Acolyte2

A clone of the FailBot mod. Announces raid member failures such as "Player1 fails at frogger"

Friends & Guild Data Broker plugin.

Adds talent specialization role status to Grid.