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

Wowhead Data dump for GatherMate2

Achievements

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

Caith skin for Masque.

Serenity skins for Masque.

Apathy skin for Masque.

Entropy skins for Masque.

Cirque Skins for Masque

Onyx skins for Masque.

Find five Ephemeral Crystals, get a pink hippogryph

LiteStep skins for Masque.

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

Where the lore is at

Teleporters in Suramar? Sure, why not?

Gears skins for Masque.

Automatically enables or disables combat logging based on location.