WowAce

XP and Reputation bars

opens/closes all bags when at merchant (instead of only the backpack)

Loot management tool

rSelfCast

Keeps track of honor, PvP statistics, BG Marks, and Arena points.

Provides a quick display for the LFG Call to Arms

Allows custom-triggered boss mod timers to be created

Warns you with sounds when you gain different shaman spells.

Shows optimal target to use various area healing spells

Shows the group leader, raid assistants, and master looter in Grid.

A Perl layout with oUF.

Assist you with faction transfers letting you know which mounts, spells, etc you have and what they will be swapped to.

Fade Blizzard Raid Frames

Replacement for the default minimap.

LDB data feed plugin designed to display various statistics derived from the Recount addon.

Shows the price of a single item in the Auction House.

Advanced Chat Filtering and Spam Blocking Addon

Embeddable library to track raid/party roster

Objective Tracker

Configuration library