XSLT

The magic XML transformation powder.

• XMacL - many resources.
• Google AJAXSLT - a JavaScript library for XSLT.
• Extending libxslt with Python
• XHTML to Markdown converter - a .xsl file to convert XHTML to Markdown text format.
• http://www.webmasterbase.com/article/602/13
• XSLTTools for Mac OS X, including AppleScript bindings.