Try pandoc!
from
Markdown
Markdown/strict
reStructuredText
Textile
LaTeX
HTML
DocBook
MediaWiki
to
HTML
HTML 5
Markdown
Markdown/strict
reStructuredText
AsciiDoc
Emacs Org Mode
LaTeX
ConTeXt
Groff man
Texinfo
DocBook
OpenDocument
RTF
MediaWiki
Go
pandoc