DocBook to LaTeX Publishing transforms your SGML/XML DocBook documents to DVI, PostScript or PDF by translating them in pure LaTeX as a first process. MathML 2.0 markups are supported too. It started as a clone of DB2LaTeX.
xindy is an index processor that can be used to generate book-like indexes for arbitrary document-preparation systems. This includes systems such as TeX and LaTeX, the roff-family, and SGML/XML-based systems (e.g., HTML).