The Panotools site is currently off line.

Mirror sites can be found at:

http://www.path.unimelb.edu.au/~dersch/ (version 2.61)
http://www.all-in-one.ee/~dersch/ (version 2.6)
http://home.no.net/dmaurer/~dersch/Index.htm (version 2.2 and 2.5 beta)