Text::Markdown::Discount(3pm) on Linux
The text dbbed47ad12a, as Debian 7 (Wheezy) shipped it.
Perl extension interface for "Discount", an implementation of John Gruber's "markdown" <http://daringfireball.net/projects/markdown/> in C developed by David Loren Parsons <http://www.pell.portland.or.us/~orc>.