Callisto CMS is an XML/XSL Web-based Content Management System[1] built using Perl and AxKit. Designed for maintaining XSL-based websites, it can edit various types of XML files, and providing a WYSIWYG interface by using the site's very own XSL stylesheets. Semantic data is edited on a per-region basis, in an "offline" domain (e.g. admin.domain.com). Sites can be deployed to production webservers when changes are made. The sites are deployed transactionally, and can be deployed to multiple target webservers, again, transactionally. Multiple independant sites can be managed in one Callisto installation, and one user login can be used for several sites, if given access.

http://sourceforge.net/projects/callistocms/