HTTPS is a server for Windows NT systems, both Intel and Alpha -- based.
It is available via anonymous FTP from emwac.ed.ac.uk in the
directory pub/https (URL is
ftp://emwac.ed.ac.uk/pub/https).
(Be sure to download the version appropriate to your processor.)
You can read a detailed announcement at the FTP site, or by
using the URL
ftp://emwac.ed.ac.uk/pub/https/https.txt.
A professional version is also available
(URL is http://emwac.ed.ac.uk/html/internet_toolchest/https/prof.htm ).