Aptconvert is a command-line tool that can be used to convert the APT format to HTML, XHTML, PDF, PostScript, (MS Word loadable) RTF, DocBook SGML and DocBook XML.
Pandoc is a Haskell library for converting from one markup format to another, and a command-line tool that uses this library. It can read markdown and (subsets of) reStructuredText, HTML, and LaTeX, and it can write markdown, reStructuredText, HTML, LaTeX
