https://github.com/larstvei/ox-gfm.git
git clone 'git://github.com/larstvei/ox-gfm.git'
This is a small exporter based on the Markdown exporter already existing in Org mode. It should support the features listed here.
The exporter has made it's way into to the contrib
section of Org, and can
be found here:
http://orgmode.org/cgit.cgi/org-mode.git/plain/contrib/lisp/ox-gfm.el
If changes are made, these will appear here before they are suggested to the Org mode mailing list.