JMathLib is used to evaluate complex mathematical expressions and display the results graphically. It can be used either interactively or to interpret script files (m-files). It is a clone of Matlab, Octave, FreeMat, Scilab but written 100% in java.
Fnattlab is a matlab clone written in java. Fnattlab is a mathematical tool mainly used for manipulation of matrices, and is intended to be completely compatible with the commercial tool Matlab. No m-files are included with fnattlab.
www.mathworks.com