Apache OFBiz™ is an open source product for the automation of enterprise processes - ofbiz.apache.org/
AntiSamy project is an API for safely allowing users to add their own HTML/CSS without exposure to XSS vulnerabilities-code.google.com/p/owaspantis…
Xalan-Java is an XSLT processor for transforming XML documents into HTML, text, or other XML document types - xml.apache.org/xalan-j/