WowAce

A Data Broker display for combat statistics.

Shared handling of media data (fonts, sounds, textures, ...) between addons.

Blocks Chinese Chat

CombatAnnounce

ORLIC

Reverse Engineering will drill down and search your tradeskills for their elements

FuBar_MiniPerfsFu

Accelerates Camera Zooming

Saves and restores your action bars.

Adds a button to your character and inspect window that shows a summary of gear enchants and gems.

Mute error messages of N next spell cast.

Create reagents easily

FelwoodFarmer

PetBar

One-click smart mounting.

Fires events whenever a raid member "fails".

Highly-configurable shield / absorb tracker.

OneChoice tries to help you reduce quest reward choices down to, ideally, one choice.

Buff reminders and more

Provides more visible access to dungeon and raid difficulty settings via FuBar.