RareScanner is an addon for World of Warcraft that includes a group of tools to help you track rare NPCs, treasures and events while you play.

The notable tools that RareScanner includes are:

Alerts from nearby rare NPCs/treasures/events

This is the main feature of RareScanner. The addon displays a button in the middle of the screen with information about all the entities detected nearby. Around the button information related to the entity is displayed, such as a miniature (in the case of an NPC), the name of the entity and the loot that you could obtain after killing/collecting it.

more info: