JOctave is a Matlab like java application that allows you to run Matlab/Octave scripts. I forked it from JMatlib because JMatlib is missing many of the functions of Matlab and Octave and wanted to change it. This project attempts to be more like Octave. I have tried to become a contributor to JMatlib but had none of my requests replied to so decided to create my own fork.
Check out code.google.com/p/joctave to download the latest version.