WowAce

Scan for rare mobs so you can find them and their loot

A modular, lightweight and screen-estate saving grid of party/raid unit frames

Chat addon, filtering messages and UI changes

AddOn development framework

Tracks Raid/Instance/World Boss lockouts for all your characters, daily/weekly quests, currencies, trade cooldowns, and more!

Auto repair + shows durability.

A library to provide a markup syntax

A library to provide unit-oriented tags to LibDogTag-3.0

Tracks herbs/ore/items that can be broken into component pieces

Library of compressed itemid sets.

Allows you to view all items from all your characters on the same account, when-ever and where-ever you want.

Inventory Management with virtual bags divided into sections.

A powerful, comprehensive utilty for displaying graphics and information based on buffs, debuffs, and other triggers.

Give whispers an instant messenger feel.

Shows where the equipment of inspected users or yourself is from.

Afflictions display and cleaning for solo, group and raid with advanced filtering and priority system.

Another HUD addon

Changes the look of the default UI

Grabs bugs for the bug sack.

Toss those bugs inna sack.