WowAce

Action button layout and configuration

Adds indicators to the sides of Grid frames.

Baggins_ItemRack

Opacity effect on action buttons in cooldown.

Good looking, smoothy and helpful nameplates

Provides training reminders to help decipher the Blizzard Spell Alerts.

Ignore more than 49 people, autoshared between your alts

Announce which globule to kill during the Yor'sahj the Unsleeping encounter.

AnyFont

Adds a third text indicator to Grid.

Bag and item management utilities

Makes the Battle Objectives Frame movable

TEALib

Automagically call who should cross over

Simple and rich Death Knight rune customizations

Simple, nice-looking power bar addon for all classes.

CraftBotFu

Shows the duration of the most recent (or current) combat

MD5Lib

Reports the total threat on a mob at the end of combat.