The following projects are released under the GNU Public License for version 1.3.x of the Apache Web Server:

mod_xobjex [download]
Using Daniel Veillard's libxml2 and libxslt, mod_xobjex converts HTTP requests into an XML DOM for transformation with XSLT.

mod_rssindex [download]
Like mod_autoindex except that mod_rssindex creates an RSS 2.0 feed of the directory containing the requested URI.

mod_xmltime [download]
XSL 1.0 does not have a time function. mod_xmltime provides a URL that returns an XML graph containing the elements of a date in local and GMT.