WowAce

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

Toss those bugs inna sack.

Restores access to removed interface options in Legion

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

Makes the default frames moveable via simple drag and drop

Tracks rare drops, including companions and mounts

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

A library for transmitting and receiving latency information of players.

A library for transmitting and receiving durability information of players in your group.

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

Give whispers an instant messenger feel.

Library that handles chat output.

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

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

The original HandyNotes source for where things are in Battle for Azeroth

Database of item upgrade IDs

The original source for where things are in Pandaria

Show item levels in the character frame

Officially the original source of knowledge of where things are in Draenor during Warlords, in HandyNotes