WowAce

GrindStatus

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

XRS

Automated smart raid marking to speed up trash clearing in instance runs

Queing of /who and SendWho() queries and a much better interface (see docs), with gurantee to be executed & callback.

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

Configure triggers to send messages to your raid team such as timers, rotations, and health/power based triggers. Raid smarter not harder.

CandyBar style cooldown display

Try on different gear and see their total stats and their differences. In short, an ingame CT-Profiles-like addon.

Switch macro depending on zones or BigWigs boss modules.

HUD that you can tweak the way you want.

Makes a sound when your focus starts casting. Use with [target=focus] macros for interrupts (Counterspell, Spell Lock, Wind ...

Wowhead Data dump for GatherMate

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

Reduces interface tedium by doing the little things for you.

Regain that wasted space!

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

Drop the cheapest thing you're carrying

Max Camera

ArcHUD2