WowAce

Provides data about all artifacts in the player's possession.

MaxStats

Announces results of readychecks to the raid/party, installs "/rc" alias, shows rc timer bar

Adds pipes which can control arbitary other statuses (like toggle status on key or "in combat"-state).

An easy-to-follow guide for visiting all of the Midsummer Festival bonfires.

Shows optimal target to use various area healing spells

Fade Blizzard Raid Frames

Manages the SavedVariables of your addon with a layered hierarchy of settings.

Shows a countdown bar for the duration of auras (e.g. HoTs, DoTs)

Automagically call who should cross over

A simple addon that warns you if your pet isn't attacking while you're in combat.

Reputation

Reserve raider tracking for EPGP.

Displays Currencies as a Data Broker source

LootWhore

Adds a Friendly Fire mode and data collection to Skada.

KivinConsoleXP

Resizes Blizzard raid frames, and adds additional options.

Simple search inspired by vBagnon

Tracks interrupts