WowAce

A library for transmitting and receiving latency information of players.

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

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

Displays additional information for Mythic Keystone dungeons

Makes the default frames moveable via simple drag and drop

Give whispers an instant messenger feel.

Library that handles chat output.

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

Replacement for the default UI's StaticPopup dialogs.

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

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

Parses ToC and adds About panel to Interface options

The original source for where things are in Pandaria

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

Show item levels in the character frame

Wowhead Data dump for GatherMate2

Restores access to removed interface options in Legion

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

Officially the original source for where things are in the Broken Isles, in HandyNotes