WowAce

Cartographer_Mining

Shows a circle on the minimap to indicate spell range

AltClick an item in your bag to add it a mail, auction, or trade frame, and alt-click to buy a stack if reagents.

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

The One-Key-Mount™ — Simple to use, configured with Rock

Combat log evolved.

A library to track nameplates.

Aura alarm.

Dims action buttons.

Tells you which blob to kill at the Yor'sahj encounter in Dragon Soul.

A small checklist for raid (de)buffs and who brings what.

Quickly assign the highest follower to each building or unassign all of them.

Tracks the precise arrival & departure schedules of boats and Zeppelins around Azeroth and displays them on the Mini-Map and ...

Ironi's Encounter Event Tracker

Babble-2.2

Threat-2.0

Highly-configurable shield / absorb tracker.

Allows you to preview weapon glow in Dressing Room.

Provides shareable notes and other information for your guild, party and raid community.

Fires events whenever a raid member "fails."