Pararesearchers Amityville Horror Page
Para-Researchers' site about Dr. Stephen Kaplan, the first parapsychologist to come to the house. He was kicked out by George Lutz who hired the Warrens shortly after. Dr. Kaplan wrote a book that claimed the AVH was a hoax, and died shortly after it was published.

The Amityville Horror, fan site
Site with dubious facts but some good photos.

Ghost Research.org
A site looking into the truth about it - with letters from parapsychologists. Contains mp3 interviews with George, letters to newspaper editors by George Lutz and their editors' responses, other articles relating to the Lutz family, Lutz writes a huge page explaining the significance of various things in the movies versus the books, and talks about the MGM remake.

The Amityville Horror Truth
A similar site to the official Amityville horror site. This site contains documents, photos, interviews and articles about the Lutz family and the murders.