WowAce

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

Displays additional information for Mythic Keystone dungeons

Grabs bugs for the bug sack.

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

Library that handles chat output.

Library providing multi-column tooltips.

Postal: Enhanced Mailbox support

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

Simple and Advanced combined - Bartender4 ActionBar AddOn

Toss those bugs inna sack.

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

Chat addon, filtering messages and UI changes

Makes the default frames moveable via simple drag and drop

Myslot is for transferring settings between accounts. Feedback [email protected]

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

Give whispers an instant messenger feel.

Tracks rare drops, including companions and mounts

A skinning engine for button-based add-ons.

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

Arena unit frames