WowAce

Automatically invites player from templates.

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

A library to handle rearrangement of blizzard's frames when bars are added to the sides of the screen.

Sets the DND flag, when are in combat.

A boss encounter engine used by other add-ons

Rawrkitty

Simple library that handles multiple levels of logging.

A death track window for Recount

SpellWatch

Shows who controls Wintergrasp and the time until the next battle.

Display who crossed the charges on Thaddius

TradeBar

Prospecting and Disenchanting Aide

Social tracking suite.

Displays information about the current zone on the World Map

DebuffEnough

Shows you which bosses you've killed next to the raid finder frame.

Eliminates the spam from the chatframe and sums it up in a broker plugin.

FuBar_ModMenuTuFu

Adds item values to chat messages.