WowAce

Keeps track of current money and all your characters on one realm.

Loudmouth

HUD that you can tweak the way you want.

Adds mob patrol paths to your map.

Library providing mappings between trade skill recipes, spells and created items

One large inventory.

CraftList2

Compact & customizable filtering, monitoring and grouping of buffs and debuffs

FuBar_TrainerFu

Plan raid callouts and cooldowns on a boss timeline and sync them to your group before the pull.

A lightweight addon that does something.

Keeps track of your reagents for buffing.

Compact rune and proc display for Death Knights.

A library for PvP and Battlegrounds

Regain that wasted space!

A library to help with localization of Zones.

Shows mana usage as a percentage in a spells tooltip.

Keeps track of performance of memory, latency, and framerate.

A bin for all your LibDataBroker buttons

Shows skills in a tooltip and allows them to be used.