WowAce

FuBar_SoulJarFu

Role playing AddOn that shows extra information about characters as entered by the player.

TabletLib

Raid Frames using the oUF framework.

Babble-2.2

Tracks vulnerability debuffs on multiple mobs

New/Old BG indicator, Join by ID, Quick Leave Queue, etc.

Adds custom effects to your cursor.

Auto and random summon highly customizable for your pets and mounts, with Data Broker support.

Tracks SendAddonMessage Spam

Regain that wasted space!

Sheppard

Threat-2.0

Mutt (Macro Update Target Tool) provides slash-commands that can patch the predefined targets in your macros.

Display an informational fighter jet style HUD while flying or riding

Automatically and immediately cancels all in-game cinematics and movies

Adds two icon indicators to each corner (total: 8 icon indicators).

Allows tradeskill usage by clicking items or reagents.

Incoming Heals

Shows skills in a tooltip and allow them to be used. Also keeps track of Cooldowns.