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Caelum Stella is a set of validators, formatters and converters for Brazilian common ids like Zip codes, State codes, social ids and so on. Stella also provides adapters for JSF, Struts tag libs, JSP tag libs, Hibernate Validator and JS completion.
JS XmlGUI is library which allows to describe both - logic and appearance (rendering) - of Java applications GUI's in XML. It allows to reduce amount of GUI specific Java code to minimum and to keep GUI design readable even for not programmers.