WowAce

Show item levels in the character frame

A powerful, comprehensive utilty for displaying graphics and information based on buffs, debuffs, and other triggers.

Toss those bugs inna sack.

Adds countdown voices from Heroes of the Storm to BigWigs for all supported locales.

Adds countdown voices from the heroes in Overwatch to BigWigs.

Creates and manages secure Action Buttons

Simple and Advanced combined - Bartender4 ActionBar AddOn

Scan for rare mobs so you can find them and their loot

The original source for where things are in Pandaria

Afflictions display and cleaning for solo, group and raid with advanced filtering and priority system.

Ironi's Encounter Event Tracker

Grabs bugs for the bug sack.

AddOn development framework

Arena unit frames

Allows you to view all items from all your characters on the same account, when-ever and where-ever you want.

Automatically turns on the combat log for selected raid and mythic+ instances.

Automatically leaves the global channels when inside an instance/raid and restores them when exited.

Manages social information with a focus on main-alt associations.

A UI for searching the guild roster.

Data Broker Display similar to FuBar