/usr/bin/docbook-2-fot
/usr/bin/docbook-2-html
/usr/bin/docbook-2-mif
/usr/bin/docbook-2-pdf
/usr/bin/docbook-2-ps
/usr/bin/docbook-2-rtf
/usr/bin/rlatex
/usr/bin/runjade
/usr/bin/sgml2x
You may install this package on Debian with
apt-get
install sgml2x