Paul Tchistopolskii has announced HiawathaZ for Zope, the first iteration of an XML/XSLT renderer.
In this first release, only minimal support for XML/XSLT with no caching is provided, using the Fourthought 4XSLT engine. Paul writes:
Next versions of HiawathaZ will provide incremental rendering with dtml | xslt | dtml chaining and some other cool stuff.
HiawathaZ is the start of a port of Tchistopolskii's Hiawatha-Java, a standalone web server with support for XML, XSL, and XSLScript. He has frozen development on Hiawatha-Java in order to concentrate on implementing the platform in Python using Zope.