XML Worker parses (X)HTML snippets and the associated CSS and converts them to PDF. It is an extra component for iText, and is a new version of the old HTMLWorker which used to be shipped with iText.
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.