WowAce

replaces the EncounterJournal Map boss button with the 3d model of the boss

Mute all sounds except boss emotes and addon sounds

World of Warcraft Textmate Bundle

Bloodthirst

Adds aggro coloring to oUF.

An in-game list of all hunter pet families and their abilities.

cyCircled_HKitty

Database of reforging IDs

MarkMyTarget

Real-time mastery (Harmony) analytics for Restoration Druids

Cartographer_Icons_MetaMapPack

AnswerBot is a mechanical gnome that answers TriviaBots for you!

GnomeCruncher

A customizable buff/debuff display replacement for the default Blizzard frames (with right click cancelaura support).

Context-sensitive actions for certain frames on double-clicks.

Shows Item Level and Stack Size in tooltips

LibSpecialEvents-Aura-3.0

A DPS Data Broker plugin.

Steroids

Buff and debuff timers with bars or icons.