WowAce

Enhances the default AddOns list.

Track time played, rested XP and money for all characters

Create panels for customizing your UI, sucessor to eePanels

A library to provide mobIDs for bosses.

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

Archaeology Assistant

Fires events whenever a raid member "fails."

Show item durability and quality in the character frame.

Add-on that shows which mounts can be farmed this week

Show all the leyline taps in Suramar

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

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

A blizzard group finder replacement

Configurable Castbars

Improved Questing Experience

An extension to the default WoW Unit Frames.

PvE Status Frames

Am I locked out? - Displays all RaidIDs for all chars

TomTom CrazyArrow pointing to the targeted group member

Simple and super light-weight tracking of profession links for all your alts.