WowAce

FuBar_tTracker

Provides the /in command for delayed execution.

Show all the leyline taps in Suramar

Information display for Hunters.

Prompts for canceling of pet battles if no rare pet is found in the opposing team.

Doublerightclick casting, autolure and sound enhancing

Keeps a list of all items you want and shows how much you need.

Tells you the Tiller, what food they like, and if you have fed them today for the quests A Dish for ...

Simple and clean Death Knight displays

Allows you to prevent addons from sending and receiving messages.

Provides database of quest giving npcs/mobs/objects for display on the World Map/Minimap

Note + rep tracking for players, with guild data sharing.

Considers an item against all the items you have to determine whether or not it is an upgrade

Adds talent specialization role status to Grid.

A volume control for Data Broker.

Scans your Equipment for cumulative item bonuses and sums them up.

Historian

DreamChat

Simple display and management of Away / AFK / Busy / DND status via broker or minimap

Auto sizes frame layout depending on group/raid size or predefined zone data