WowAce

Postal: Enhanced Mailbox support

Where are the hidden treasures in Battle for Azeroth? Show in HandyNotes

Tracks rare drops, including companions and mounts

Where are the hidden treasures in Legion?

Angry Assignments

Modular casting bar.

A library to handle rearrangement of blizzard's frames when bars are added to the sides of the screen.

AddOn development framework

Makes the Blizzard options frame movable and resizable

"Debug" code free since '93!

A lightweight, flexible, multi-target threat meter.

Tracks Raid/Instance/World Boss lockouts for all your characters, daily/weekly quests, currencies, trade cooldowns, and more!

Sells all junk in your inventory at once.

Wowhead Data dump for GatherMate2

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

A modular, lightweight and screen-estate saving grid of party/raid unit frames

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

Tooltip scanning library.

Adds World Quests to the quest list

Adirelle's bag addon.