JEuclid is a complete MathML rendering solution, consisting of: a MathViewer application, command line converters from MathML to other formats, an ant task for autmated conversion, display components for AWT and Swing and a component for Apache Cocoon
JEuclid is an excellent MathML renderer, well written by Max Berger, a very knowledgeable person. Best of all, as a FOP (http://xmlgraphics.apache.org/fop/) plug-in, JEuclid allows to convert complex XML documents embedding MathML equations to good looking PDF. I highly recommend using JEuclid in your projects. I do that for mine.
very good project, thanks!