WowAce

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

Combat log evolved.

Buffalo

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

Angry Boss Reminders helps raiders switch to the proper talents, glyphs, and gear for each boss during a raid.

A simple range indicator for optimizing Halo damage.

Fade Blizzard Raid Frames

Bidder

ItemPriceTooltip

Custom minimalistic nameplates

Provides access to all teleporting spells and items on right click of minimap button.

Test whether the player can really dispell a buff or debuff, given its talents.

LibRock-1.0

RotLatency keeps track of your reaction to cooldown expiration.

A filter tool for blizzards TradeSkillUI

Watch tooltip updates to announce when you find specific objects

New/Old BG indicator, Join by ID, Quick Leave Queue, etc.

Sanity2

Assistance to the dance during Dread Spray

XArt