WowAce

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

Alternate Power- and Combopoint/SoulShard/HolyPower-bar

Simple, nice-looking power bar addon for all classes.

Displays reagent count on spell action buttons

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

PowerBar

A collection of Rogue modules.

TrickOrTreat

Open those pesky lockboxes

Hemlock

Holy Power, Shadow Orbs, Rogue Combo Points and Monk Chi.

LD50_abar

EnvenomX

Comergy 2

Melee stats Data Broker plugin.

Cues for Rogue Rotation

PoisonSwapper automatically manages weapon swapping for maximum DPS

FuBar_NinjutFu

Provides compact ability duration bars for many cycle dependent classes.

Highlights the action bar spells that need to be kept on target or player