WowAce

Keeps track of group members and keeps an up-to-date cache of their specialization and talents.

Library that handles chat output.

Toss those bugs inna sack.

Database of item upgrade IDs

Grabs bugs for the bug sack.

Simple AceGUI3 dropdown item classes for font/statusbar/sound/etc.

Replacement for the default UI's StaticPopup dialogs.

Parses ToC and adds About panel to Interface options

Postal: Enhanced Mailbox support

Chat addon, filtering messages and UI changes

Tracks rare drops, including companions and mounts

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

Modular casting bar.

Makes the default frames moveable via simple drag and drop

Restores access to removed interface options in Legion

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

Displays additional information for Mythic Keystone dungeons

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

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

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