WowAce

TextSpy

Shows a window displaying any raid member below 10,000 health during the Chimaeron encounter.

A lib to manage action bar and timers

Adds aura indicators to unit frames

Customize the appearance of the chat bubbles.

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

Speed plugin for any DataBroker display.

Improvements to the standard Blizzard Eclipse bar for balance druids. Use /ebp for the config screen.

Shows a money overview for your current realm in the tooltip on the money in your bags

XML import library

Facilitate better communication for loot councils

Tracks Black Market Auction House auctions.

A noble spirit embiggens the smallest player arrow.

Makes grid QuickHealth aware

WhisperBid

Automatically and immediately cancels all in-game cinematics and movies

Add-on that shows which battle pets can be farmed this week

Modifies the inbox into a scrollable inbox, including open all options

Checklist2

For Developers (of Addons which uses LibWho-2.0): show queues and queries in realtime