WowAce

Provides one or many informational windows with optional interactive widgets.

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

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

Where are the hidden treasures in Battle for Azeroth? Show in HandyNotes

Where are the hidden treasures in Legion?

Displays the locations of Summer Festival bonfires.

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

Find five Ephemeral Crystals, get a pink hippogryph

Achievements

Teleporters in Suramar? Sure, why not?

Displays the locations of Lunar Festival elders.

Show the appearance of an item when you mouse over it

Displays the locations of Garrison music scrolls.

Show all the orbs for triggering Kosumoth

Displays the locations of Hallow's End candy buckets.

Show all the leyline taps in Suramar

Adds mob patrol paths to your map.

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

Show where the chests are for Withered Army Training