WowAce

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

The original source for where things are in Pandaria

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

Officially the original source of knowledge of where things are in Draenor during Warlords, in HandyNotes

HideTalkingHead

Drop the cheapest thing you're carrying

Point to quest POIs on your minimap

Track time played, rested XP and money for all characters

Improved Questing Experience

Bayi's Extended Questlog

Teleporters in Suramar? Sure, why not?

Where the lore is at

Show vignette icons sooner

Find five Ephemeral Crystals, get a pink hippogryph

AutoMagicly clicks though Daily Quests, and Turns them In.

QuestLog

Show all the leyline taps in Suramar

Keeps account of attendance and loot for raids, parties, bgs, arenas and solo for questing.

Show all the orbs for triggering Kosumoth

Quest History tracker and shows lists of quests in each category