XML/XHTML and CSS 2.1 renderer in pure Java
Extension for Jackson JSON processor that adds support for serializing POJOs as XML (and deserializing from XML) as an alternative to JSON
Ultra-high performance non-blocking XML processor (Stax API + extensions)
jOOX - The Power of jQuery Applied to W3C DOM Like JDBC, DOM is a powerful, yet very verbose low-level API to manipulate XML. The HTML DOM an be manipulated with the popular jQuery product, in JavaScript. Why don't we have jQuery in Java? jOOX is jQuery's XML parts, applied to Java.
XML Builder is a utility that allows simple XML documents to be constructed using relatively sparse Java code