WowAce

Database of item upgrade IDs

Handy notes for your maps

Toss those bugs inna sack.

Library providing multi-column tooltips.

Simple and Advanced combined - Bartender4 ActionBar AddOn

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

Displays additional information for Mythic Keystone dungeons

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

Postal: Enhanced Mailbox support

An intuitive keybindings library.

Replacement for ActionButton_Show/HideOverlayGlow APIs

Tracks rare drops, including companions and mounts

Give whispers an instant messenger feel.

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

Chat addon, filtering messages and UI changes

Creates and manages secure Action Buttons

Library to check whether an item is equipable / appropriate for a given class

Makes the default frames moveable via simple drag and drop

Replacement for the default UI's StaticPopup dialogs.

Restores access to removed interface options in Legion