DocBook is an XML vocabulary which enables you to create document content in a presentation-neutral form that captures the logical structure of the content. Using the DocBook Project XSL stylesheets, you can publish DocBook content as HTML pages and PDF files and other formats, including man pages, HTML Help, and JavaHelp.
The ManEdit UNIX Manual Page Editor is an editor specifically tailored for UNIX manual pages. It has a preview viewer, uses the manual page XML format for easy editing, and comes with a tutorial and reference guide. It uses the GTK+ widget set and features syntax highlighting, a complete drag and drop system for easy viewing and editing, a crash recovery system, and sample manual page templates.
doclifter helps with lifting documents with nroff markup to XML-DocBook. Lifting documents from presentation level to semantic level is hard, and a really good job requires human polishing. This tool aims to do everything that can be mechanized, and to preserve any troff-level information that might have structural implications in XML comments. TBL tables are translated into DocBook table markup, PIC into SVG, and EQN into MathML (relying on pic2svg and GNU eqn for the last two).
xslui is an XSLT applet to display Web pages with a modularized XML file in Web browsers. This applet can design page layout by arranging square blocks called "areas". Thus it is very easy to display layouts like horizontal columns. This layout feature can also separate descriptions of an area's arrangement and contents, even in different files. This feature provides Web pages with modularization and sharing of their parts. In addition, xslui has data operating elements with the xsldo library, which can operate on XML data in the same or other XML files as the display data. This feature provides separation of views and data.
xsddoc is a documentation tool for W3C XML schemas based on XSLT. This multiple schema documentation generator creates JavaDoc like documentation of your W3C XML schema. It is platform independent and usable from the command line, as an Apache Ant task, or as an Apache Maven plugin.
RenderX XEP is a commercial-grade application written in Java for dynamic rendering of XML documents. XEP is a pluggable architectural component that takes two open standard inputs, XML data and XSL FO stylesheet, and produces the industry's defacto standards for high-quality rendered electronic documents, Adobe PDF and PostScript. XEP supports many extensions to the XSL FO specification, including SVG graphics and PDF-to-PDF linking.