WowAce

Entropy skins for Masque.

Provides one or many informational windows with optional interactive widgets.

FlexBar2

Keeps track of quests.

Bulk mail reception made really easy

GrindStatus

SRA

mount and companion manager

Shows simple Buttons for your Cooldowns :)

Remember locations that city guards direct you to for HandyNotes

XRS

Display Cooldown Count of Spell Icon and Item

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

Shows skills in a tooltip and allow them to be used. Also keeps track of Cooldowns.

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

Checks your gear before bosses and yells at you if you're an idiot

Database of Diminishing return categories and general data

Raid Frames using the oUF framework.

Create panels for customizing your UI, sucessor to eePanels

Alternate Power- and Combopoint/SoulShard/HolyPower-bar