WowAce

Allows the user to preview and track their progress in the collection of various transmogrification appearance sets

Provides shareable notes and other information for your guild, party and raid community.

FuBar_VampwatchFu

ItemSync the happy item gatherer and toolkit.

Henge

A library to help with localization of item types and subtypes.

eeShards

TrackingBar

Numen

ArcHUD2

Modular and lightweight party/raid frames.

Enhances the default AddOns list.

A simple slash-command-based addon for querying item information from the Blizzard servers via ItemIDs and SpellIDs.

Combination of Titan LootType and Roll - stripped down and cleaned up.

Tracks SendAddonMessage Spam

DKP system for all guilds in the Banana Republic.

Personal buff monitor - are you buff enough?

Toggles WoW to the forground on events.

Fires events whenever a raid member "fails."

A library to track nameplates.