WowAce

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

Marks the locations of Midsummer Fire Festival bonfires on the worldmap and minimap.

Tracks the HoTs you cast.

mount and companion manager

Automated smart raid marking to speed up trash clearing in instance runs

Adds a status to Grid for debuffs applied by Raid Bosses.

One large inventory.

Quest History tracker and shows lists of quests in each category

Assessment

Drop the cheapest thing you're carrying

Provides access to all Portal and Teleport spells on right click of one button.

Smooth combat HUD based on ArcHUD2

AutoMagicly clicks though Daily Quests, and Turns them In.

Queing of /who and SendWho() queries and a much better interface (see docs), with gurantee to be executed & callback.

Adirelle's unit frames, based on haste's oUF.

Shaman totem bar

Collects Herbs, Mines, Gas Clouds and Fishing locations and adds them to the worldmap and minimap

Provides one or many informational windows with optional interactive widgets.

Display auras on action buttons.

Keeps track of quests.