WowAce

A powerful, comprehensive utilty for displaying graphics and information based on buffs, debuffs, and other triggers.

EBB adds groups of bars to your screen showing you which (de)buffs currently affect your toon or some other units.

Textures for Stop Motion

Threat reactive nameplates for TidyPlates.

Display auras on action buttons.

In-game theorycraft. Calculates actual damage/healing based on gear, talents and buffs.

Numerical and graphical display of Combo Points and similar buffs/debuffs. Also tracks Holy Power and Soul Shards.

Rebuff yourself with the mousewheel.

SacredBuff

Kaliban's Class Loot List Star Display

Co-ordinated targetless Party and Raid wipe recovery. Evolved

Additional information about player spells.

Tankadin

Simple, light-weight, LDB-enabled timer that tracks how long you spend in combat

Track all threat redirection ability transfers and cooldowns (Misdirection and Tricks of the Trade).

Hides MicroButton Alerts

Checks your gear before bosses and yells at you if you're an idiot

Compact & customizable filtering, monitoring and grouping of buffs and debuffs

A full package of auras for all 3 Shaman specializations

Tracks skill and tradeskill costs and progressions, as well as trainer locations.