WowAce

Shows the spec of people around you in the tooltip.

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

Never forget which one in that 5-mob pull casts what spell again.

PoisonSwapper automatically manages weapon swapping for maximum DPS

FuBar_MonkeyQuestFu

Show a bar indicating the unit's Holy Power count.

MonkeyPirate

Advanced Chat Filtering and Spam Blocking Addon

Adds a highlight border to items in your MogIt Wishlist, making them easier to see.

Historian

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

aX_RaidStatusConfig

Fubar Plugin for Simple Soulstone

Allows you to loot BoP items without prompting when not in a group or raid

agUF style oUF layout

LDB display for Oak Interrupts Broker

Durability Data Broker plugin.

Scaffold

EnhancedLFG

Automatically sells low quality gray items to the vendor.