WowAce

Personal buff monitor - are you buff enough?

Keeps track of space left in your bags.

Raid Frames using the oUF framework.

Track all threat redirection ability transfers and cooldowns (Misdirection and Tricks of the Trade).

FuBar_BattlegroundFu

QuestLog

LDB display of currencies, gold totals and session / daily / weekly statistics for all characters on a server.

Displays item durability and repair cost.

SRA

Library handling communcation for Magic* addons

A core for your informational plugins to plug into.

InspectFix

Displays information about the current zone on the World Map for WoW Classic Era

Adds party/raid role icons in useful places

Automatically leaves the global channels when inside an instance/raid and restores them when exited.

Dims action buttons.

Provides database of quest giving npcs/mobs/objects for display on the World Map/Minimap

Adds various hearthing items to AdiBags virtual groups

KoS-Management Tool

Displays Pet Info for Hunters and Warlocks. Also keeps track of Stables and Pet and Demon skills.