WowAce

Database of item upgrade IDs

Grabs bugs for the bug sack.

Library that handles chat output.

Library providing multi-column tooltips.

Toss those bugs inna sack.

Collects Herbs, Mines, Gas Clouds, Archaeology, Treasure and Fishing locations and adds them to the worldmap and minimap

Postal: Enhanced Mailbox support

Simple and Advanced combined - Bartender4 ActionBar AddOn

Collects Herbs, Mines, Gas Clouds, Archaeology, Treasure and Fishing locations and adds them to the worldmap and minimap

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.

Chat addon, filtering messages and UI changes

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

Does stuff for sachmo

Makes the default frames moveable via simple drag and drop

Give whispers an instant messenger feel.

Replacement for ActionButton_Show/HideOverlayGlow APIs

An intuitive keybindings library.

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