WowAce

Provides quick notification (sound and visual) of your tanking status of your current target. Meant for tanking.

Automagical macros for each talent tier.

Shows a nice Soulstone Monitor.

FuBar_FuXPFu

Adds aura indicators to unit frames

Control screenshot format and quality via FuBar

Library to help with querying unit talents.

A boss encounter engine used by other add-ons

A full package of auras for all 3 Shaman specializations

BankAccountant

FuBar_CraftTimersFu

MonkeyPirate

Leveling guides for trade skill professions.

Reverse Engineering will drill down and search your tradeskills for their elements

SacredBuff_Mounts

Allows combined aura detection. motw + gotw, all 4 mage int buffs, etc. in one status.

Nihilum Raid Tracker, originally written for the EU guild Nihilum.

AceBuffGroups

Shows your standings with the factions.

Shows who controls Wintergrasp and the time until the next battle.