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.