UWOBO is a XSLT Stylesheet processor running as a HTTP server.
VeniVidiVoti is a collaborative writing web site as the basis of a democratic system.
Web Services Invocation Framework (WSIF) is a tool that provides a standard API for invoking services described in Web Services Description Language (WSDL).
xml-lit aims to be a complete literate programming system in the style of Donald Knuth's WEB. For those unfamiliar with the concept, literate programming is an attempt to solve many of the problems in program design and maintenance by fusing the tasks of documenting and writing code.
xmlto is a front-end to an XSL toolchain. It chooses an appropriate stylesheet for the conversion you want and applies it using an external XSL-T processor.
XPath Methods can be used to perform XPath queries against ParsedXML XML documents.
XTemplate is a template engine for PHP which allows you to store your HTML code apart from your PHP code. It has many useful features such as nested blocks and various kinds of variable interpolation.