Billy for Kids:
A website for beginners and youth. It has animations and is it fun to navigate. It comes in over 11 languages. It has a simulator of a spaceship to travel through the Solar System and planets in other star systems.
Future of Mankind:
Website in English. It has a lot of information about Bily Meier, including a photo library and several of the contact notes.
Michael Horn's Website:
He is the representative of the Billy Meier case in the USA. His site contains plenty of downloadable material, including prophecies and predictions, photos, videos, and a blog. Michael has produced several documentaries about the Billy Meier case.