WowAce

Show the appearance of an item when you mouse over it

Dog-themed unit frames. Woof. Arf. Yip.

Point to quest POIs on your minimap

Show item levels in the character frame

Postal: Enhanced Mailbox support

Food/water macro generator

Modular casting bar.

Makes the default frames moveable via simple drag and drop

Drop the cheapest thing you're carrying

AddOn development framework

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

Entertaining kill-shot notification.

Restores access to removed interface options in Legion

Tracks rare drops, including companions and mounts

Another HUD addon

A skinning engine for button-based add-ons.

Adds spec switching support to individual AceDB-3.0 databases.

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

Provides access to all Portal and Teleport spells on right click of one button.

Tracks herbs/ore/items that can be broken into component pieces