| [Maruku]: http://maruku.rubyforge.org | |
| [PHP Markdown Extra]: http://michelf.com/projects/php-markdown/extra/ | |
| [Pandoc]: http://johnmacfarlane.net/pandoc/ | |
| [MathJax]: http://www.mathjax.org | |
| [BlueCloth]: http://deveiate.org/projects/BlueCloth | |
| [RedCloth]: http://redcloth.org/ |