Anastasia is a SGML/XML publication tool which allows the processing and searching of large documents using tcl scripting. See https://github.com/peterrobinson/Anastasia2 for updated code, etc, for running in Apache 2 environments.
Radix is a RAD framework for creating native XML web applications. Complete web applications can be created without programming knowledge using XML, XSLT, XPath and related technologies. Radix can be extended using Java, JavaScript, Python, and Tcl.