WowAce

Switch macro depending on zones or BigWigs boss modules.

Provides quick access to information on your group and their equipment, enchant and gem choices.

RootsBidder

Co-ordinated targetless Party and Raid wipe recovery. Evolved

Provides shareable notes and other information for your guild, party and raid community.

Inspects all members of raid and saves in database, as well as lists people's dkp values

Heads-up minimap display

An addon to assist with organizing healing in a raid set up.

Reports in raid chat whenever a raid member "fails." /EnsidiaFails to configure.

Loot management tool

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

adds navigation buttons to Encounter Journal

XRS

Smart raid loot and DKP tracker with automated standby and learning

Plays sound when a ready check, LFG queue, battleground queue, or world battleground queue pops even if you have sounds turne...

Incoming Heals

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

Adds achievement reminders to BigWigs

Announces interrupts in the chat

Keeps account of attendance and loot for raids, parties, bgs, arenas and solo for questing.