Dept. of Mechanical Engineering/Centre for Medical Image Computing BSD License Yes University of Sheffield/University College London NITRC Nifty Sim Yes Nifty Sim is a high-performance nonlinear finite element solver, developed at University College London. A key feature is the option of GPU-based execution, which allows the solver to significantly out-perform equivalent commercial packages. Nifty Sim PET/SPECT, BSD License, Alzheimer Disease http://www.nitrc.org/projects/niftysim/, http://www.nitrc.org/projects/niftysim/