Martin, just a few remarks about GROMACS usage: 1. GROMACS is based on FFT software (Fourier Transformation), so you have to install it before installing GROMACS 2. GROMACS output files are pdb/gro files for structures and xvg for raw data. pdb files are readable by Rasmol, VMD and other common molecular graphics tools, bu gro files are only processed and displayed by VMD, so I sugges to download it. xvg files are naturally read by xmgr, but I don't know if it is mantained yet or not: a good alternative is xmgr. SUSE 9.0 provides xmgr, but you can also download it from the web (Weizman Institute is the software provider and mantainer, if I remember well). 3. In the GROMACS section dedicated to developers, you can find also some unofficial tools for GROMACS: browse the section for your purpose. LM