WowAce

Sneakily inspect how much gold your mouseover target has made so far.

Angry Boss Reminders helps raiders switch to the proper talents, glyphs, and gear for each boss during a raid.

Profession launcher objects for any Broker display

Automatic ammo reloading and selection, with warnings.

Fudge

Powerleveling guide framework

pMutilate

SQL-driven database system for Lua

Flames anyone who lets his debuff expire on Malygos Phase 3

nRaidTracker

Bars showing amount of buffstacks

Congratulate people when they ding

A popup menu containing user-programmable scripts.

Helps you see the Halion's Corporeality during phase 3

FuBar_WintergraspFu

oUF element for highlighting debuffs that are dispellable by the player

TradeStop

Tells you which blob to kill at the Yor'sahj encounter in Dragon Soul.

xchar

Allows movement and scaling of class-specific resource displays