Text-markover is a project mainly written in Perl, it's free.
Experimental Markdown Parser Implemented with HOP
Back in 2009, I thought it would be a good idea to write my own Markdown parser in Perl. I had some ideas on syntaxes for definition lists and tables and wanted to make them so. So I started work using the only parser I knew anything about, HOP::Parser.
After a while, I got busy with real work, not to mention frustrated with HOP (which really was more of an experiment itself, although the book is great), so the project went on permanent hiatus.
Later, Dave Rolsky was kind enough to write Markdent::Dialect::Theory, which implement most of what I wanted. So if you're really interested, check it out.
In the meantime, as my Subversion server is going away, I've moved the code to GitHub, on the off chance that someone else might find it vaguely interesting.
Copyright (c) 2009, David E. Wheeler. Some Rights Reserved.
This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.