WowAce

Broken in Midnight. I recommend MidnightFocusInterrupt instead.

Displays the time remaining before your (temporary) pet is dismissed.

Heads Up Display with Player and Target Info

KoS-Management Tool

Aura alarm.

Shows the health of the player's current bodyguard.

pDebuffList

Helps you decide which ability to use next according to priority you set

Adds Scrolling Combat Text above your character

CombatLog in SimpleCombatlog style

Barks at you when you target a crowd-controlled unit

Combat log evolved.

Estimated time until current target will die.

Disease Tracker for Death Knights.

Alternate Rune Display

Monk Brewmaster/WindWalker Priority and Buff/Debuff Tracking Tool

Gathers statistics on certain chance-on-use spells, also known as procs.

A full package of auras for all 3 Shaman specializations

A simple range indicator for optimizing Halo damage.

Display the global cooldown around your cursor. (+ other stuff)