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) HTML, reStructuredText, LaTeX, DocBook,
MediaWiki markup, Haddock markup, OPML, Emacs Org-Mode, txt2tags and
Textile, and it can write markdown, reStructuredText, HTML, LaTeX,
ConTeXt, Docbook, OPML, OpenDocument, ODT, Word docx, RTF, MediaWiki,
DokuWiki, Textile, groff man pages, plain text, Emacs Org-Mode,
AsciiDoc, Haddock markup, EPUB (v2 and v3), FictionBook2, InDesign ICML,
and several kinds of HTML/javascript slide shows (S5, Slidy, Slideous,
DZSlides, reveal.js).  Pandoc extends standard markdown syntax with
footnotes, embedded LaTeX, definition lists, tables, and other features.
A compatibility mode is provided for those who need a drop-in
replacement for Markdown.pl.

WWW: http://johnmacfarlane.net/pandoc