WowAce

Action button layout and configuration

Tracks interrupts

Resizes Blizzard raid frames, and adds additional options.

Really very early stage. No, earlier than that.

Automatically switches Profiles of addons when changing spec

Makes those pesky garrison animations go away.

Aggro Warning System for Parties and Raids.

FuBar_KungFu

What did you just loot?

SpoilsOfWar

PowerDisplay

Status indicator that shows if a unit is hostile (probably mindcontrolled)

Grid module to emphasize units based on some configured conditions.

SalvationKiller

Adds a third text indicator to Grid.

Expiration

LDB data feed plugin designed to display various statistics derived from the Recount addon.

Eliminates the spam from the chatframe and sums it up in a broker plugin.

Provides the the health and target of by an unit targeted mob (meant to be used for tanks).

TMrecruit