EIDORS: Electrical Impedance Tomography and Diffuse Optical Tomography Reconstruction Software http://eidors3d.sourceforge.net/ This was found at: http://web.me.com/chibaf/math/octave/ Apparently, EIDORS works with both, matlab and octave. I have to remember to also check https://staff.ti.bfh.ch/sha1/fem.html