Repository has been moved to: http://dtitov.github.com/bracer
Java library for parsing and evaluating math expressions.
Javadoc is available at http://bracer.sourceforge.net/javadoc/
P.S. This library depends on Apache Commons Math, so don't forget to include commons-math-2.2.jar to your project.
TekMath is a java/swing-based viewer for the Math Markup Language (MathML) that can be easily embedded in custom java applications. It supports both content and presentation markup languages, and depends on no external packages beyond the java runtime.