WowAce

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

Displays reagent count on spell action buttons

KivinConsoleXP

RuinBossTactics

MountLib

Adds an icon to item, spell, and achievement links

Adds TargetIcon status to Grid2 (player / player-target).

Notifies you when you get aggro.

Adds custom layouts for Grid

Helps you see the Halion's Corporeality during phase 3

Standalone LibUnitID, with runtime diagnostic utilities

Aiue's Luck Point Handling Addon

Raid cooldown assignments for healers

Small Box Icon Pack for Cartographer

Interface for addons to include extra information on the GuildMemberInfo frame.

Automatically accepts and turns in the Holiday "fly around the world" quests.

A library to provide a way to easily create controls for Blizzard's options system

Show a rough range indicator

Keeps an eye on someone's distance from you, and alerts you if they get too far.

One Click Forced Exit / Logout / Reload UI button for Broker