WowAce

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

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

Tracks rare drops, including companions and mounts

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.

Show the transmog appearance of an item when you mouse over it, and shows collection-status in bags, shops, and elsewhere. Works on transmog, mounts, pets, and decor.

Displays the locations of Lunar Festival elders.

Provides one or many informational windows with optional interactive widgets.

Adds mob patrol paths to your map.

tracks and share quests between your party

QuestLog

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

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

Achievements

Displays the locations of the chests for the Treasure, Treasure Everywhere achievement

Display Garrison missons for all Characters

Find five Ephemeral Crystals, get a pink hippogryph

Teleporters in Suramar? Sure, why not?

Show all the leyline taps in Suramar