WowAce

Library that handles chat output.

Grabs bugs for the bug sack.

Library providing multi-column tooltips.

Toss those bugs inna sack.

Simple and Advanced combined - Bartender4 ActionBar AddOn

Displays additional information for Mythic Keystone dungeons

Postal: Enhanced Mailbox support

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

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

Chat addon, filtering messages and UI changes

Replacement for the default UI's StaticPopup dialogs.

Tracks rare drops, including companions and mounts

Replacement for ActionButton_Show/HideOverlayGlow APIs

Give whispers an instant messenger feel.

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

An intuitive keybindings library.

Makes the default frames moveable via simple drag and drop

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

Creates and manages secure Action Buttons

Parses ToC and adds About panel to Interface options