WowAce

Scan for rare mobs so you can find them and their loot

Tracks rare drops, including companions and mounts

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

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

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

Uses various methods to scan your surroundings for rare or specified NPCs.

Achievements

tracks and share quests between your party

Show the appearance of an item when you mouse over it

QuestLog

Marks the locations of Midsummer Fire Festival bonfires on the worldmap and minimap.

Display Garrison missons for all Characters

Adds mob patrol paths to your map.

Marks the locations of Hallow's End candy buckets on the worldmap and minimap.

Displays the locations of Lunar Festival elders.

Provides one or many informational windows with optional interactive widgets.

This will keep track of how much you have paid per item in your inventory. Only one of (Auctionator, Auctioneer, AuctionLite,...

Displays an alert whenever you loot an item for the first time.

Find five Ephemeral Crystals, get a pink hippogryph

Tracks profession specific cooldowns and items across all your characters