Scripts, utilities, and web services that act as easier-to-use "front ends" to DocBookPublishingTools.
docbook-utils, a RPM package that includes front-end utilities for using the Openjade DSSSL engine; also available as a Debian Package
xmlto, TimWaugh's front-end for using XSLT processors (but currently only understands how to use xsltproc)
sgml2x, front end for Jade/Openjade and Jadetex, written in Perl
Docbook Transformer, web transforming service from Docbook to html, you can send a url or upload a local file from your system. You can request using GET method too. By Cartesia.org.
Goshaky DocBook Online Tools Upload a DocBook-XML-File, Validate it and transform it to HTML or PDF online
DocMan (The DocBook Toolchain Manager), a GUI application that makes it easier to convert DocBook XML source files to PDF, HTML, XHTML, and HTML Help. Available for Windows and Linux.
DocBook Formatting Service, the web application to demonstrate abilities of RenderX web engine.
susedoc, a small documentation system which is used by SUSE. It consists of Makefiles and various scripts to convert DocBook XML sources into PDF, HTML or Manpages. Available for Linux only.
Note that the front-end convenience tools the docbook-utils and sgml2x packages provide (the various docbook2* and docbook-2-* utilities such as docbook2html) are, like the older db2* utilities, (mostly) just scripts that act as "wrappers" around Openjade. So if you run into problems using the docbook2* or docbook-2-* or db2* wrapper scripts, you may want to consult the Openjade documentation and use Openjade directly instead.
DocBook Wiki