WowAce

Tracks rare drops, including companions and mounts

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!

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.

Displays the locations of Lunar Festival elders.

Achievements

Show the appearance of an item when you mouse over it

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

Find five Ephemeral Crystals, get a pink hippogryph

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

Adds mob patrol paths to your map.

Teleporters in Suramar? Sure, why not?

Show all the leyline taps in Suramar

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

Show all the orbs for triggering Kosumoth

Show where the chests are for Withered Army Training

Books in Azsuna? Sure, why not?

Show vignette icons sooner