Spoiled - Text real-time Game of Thrones spoilers to your enemies.
FaxSalad - Pay-as-you-go, secure faxing.
Friends of Thrones - Extension that changes GoT spoilers into a Friends scene
Quartermaester - Interactive Game of Thrones map
Bitcoin Fax - Bitcoin Fax allows you to send a fax with minimal fuss. No sign up required. How it works:
GoT Dead or Alive Challenge - Put your Game of Thrones knowledge to the test