WowAce

Rep2 displays a message, which shows how much reputation you gained, and how much is needed until the next standing.

Cartographer_Treasure

Makes your item stats shine!

Allows for easy congratulating when someone earns an achievement.

This will keep track of how much you have paid per item in your inventory. Only one of (Auctionator, Auctioneer, AuctionLite,...

SurgeonGeneral Listen CLient

Displays a grid of guild ranks versus permissions.

ClosetGnome_Fishing

RBM

Adds indicators to the sides of Grid frames.

Announces Mage Spells in chat.

AspectsBar

Objective Tracker

Group interrupt cooldown tracking.

Calculates incoming damage avoidance and mitigation

Loot management tool

FuBar_RecapFu

Saves Auction House search queries.

RaidAgent

A simplistic clock.