Actually, the official site is:
http://www.amithlon.comThe Amithlon support site of Harald Frank, one of the developers and self-styled "founder", is:
http://www.amithlon.deThe Amithlon support site of Bernd Meyer, the main developer, was at:
http://www.amithlon.netThe legal status of the product is highly debatable. Not only is the licensing questionable, but also the IP ownership issues between the two authors are also in dispute. There are claims of all sorts on the web and in the mailing lists, but a definitive status won't be reached until and unless the matter is decided in a court of law.
Unfortunately, since an actual court case seems unlikely due to the costs involved, the legal status of the product and the IP will most probably remain under dispute.