WowAce

Show a texture on demand

Instant SLAM! notification

Libary for cleanly inspecting other players

LDB data source for herb, ore and skinning node data

GUI Configuration Library

A Mount and Companion manager

EQCompare

CCBreaker

A library to try to guess a level of a player.

Clean looking square minimap with many options.

Add a line to herb tooltips that shows what pigment they produce.

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

Lets you drag UI frames around

AltClick an item in your bag to add it a mail, auction, or trade frame, and alt-click to buy a stack if reagents.

Crowd-control monitor

Gives equipped and overall iLvl to indicate the quality of a character's gear.

Toggle Windowed Mode with click or keybind.

BuffMe

"Your quest log is full". How many quests do you have in your log?

On login, displays changes to your guild since the last time you logged in.