Существующие реализации markdown

Perl

• Оригинальный markdown
• MultiMarkdown
• Text::Markdown

PHP

• Cebe markdown
• Parsedown
• Ciconia
• PHP markdown extra
• PECL
• markdown для Drupal
• markdown для Expression Engine 1.x

C

• discount
• peg-markdown

C++

• cpp-markdown

C#

• http://www.aspnetresources.com/blog/markdown_announced.aspx
• markdownsharp

ColdFusion

• http://sebduggan.com/CFX_Markdown/

Java

• http://sourceforge.net/projects/markdownj/

Python

• http://www.freewisdom.org/projects/python-markdown/ + http://markdown.infogami.com/Extending_PythonMarkdown
• https://github.com/trentm/python-markdown2

Lua

• http://www.frykholm.se/files/markdown.lua

haskell

• http://johnmacfarlane.net/pandoc/
• http://github.com/jgm/markdown-peg

JavaScript

• http://www.attacklab.net/showdown-gui.html
• http://www.dema.ru/markdown/
• marked

Common Lisp

• http://common-lisp.net/project/cl-markdown/
• http://lifeoflevi.com/markdown.lisp

Ruby

• GitHub's markdown
• Maruku
• BlueCloth
• Discount for Ruby