saxonica 

Saxon-HE (home edition) is an open source product that provides implementations of XSLT (2.0), XQuery (1.0), and XPath (2.0) at the basic level of conformance defined by W3C.

SaxonCS is a high-performance XSLT 3.0 processor. It conforms with the latest W3C specifications (notably XSLT 3.0, XQuery 3.1, and XPath 3.1).

SaxonCS is a high-performance XSLT 3.0 processor. It conforms with the latest W3C specifications (notably XSLT 3.0, XQuery 3.1, and XPath 3.1).