Frontier 5 - A web content management system for Windows and Macintosh which has some built-in support for XML. - http://frontier.userland.com/
Apache Cocoon - 100% pure Java, Open Source publishing framework servlet that relies on new W3C technologies (such as DOM, XML, and XSL) to provide web content. The Cocoon project aims to change the way web information is created, rendered and delivered. - http://cocoon.apache.org/
Cocoon Technology Pages at luminas - Resources produced by luminas in support of the Cocoon project. Includes Cocoon-URL, the weekly summary of links posted to the mailing list. - http://www.luminas.co.uk/technology/cocoon/
XML Compiler - XMLC converts XML content to static HTML files which are then served from disk. - http://webreference.com/xml/column23/
WebX Systems - Providers of document creation, business-to-business, Web enabling and eCommerce. UltraXML, high-end WYSIWYG publishing system with real time ActiveXSL, Visual DTD editing. - http://www.webxsystems.com/