Dvipdfmx is a program to convert TeX DVI files to PDF. Its package page on CTAN summarizes current information about it.
Dvipdfmx is no longer distributed as a standalone package. It is maintained as part of the TeX Live distribution (browse source directory, retrieve TL sources). It is also included in other TeX distributions.
The dvipdfmx manual and man page are available, and also included in the distributions.
Bug reports, enhancement requests, and other discussion: please email dvipdfmx (at) tug dot org. Anyone can join the list, but it is not necessary to join to post. Archives are public.
The old home page is still available, for historical information.