FPS - The finite photonic structures package was created to allow the calculation of local density of optical states (LDOS) and density of optical states (DOS) in finite-sized non-periodic structures. We try to make calculations as easy as possible in a way that a very basic knowledge of operating system is enough to handle LDOS and DOS calculation. In the first release you need to use terminal of Linux to do calculation but in the second release you can easily use our GUI. Please check out our paper: Density of optical states in rolled-up photonic crystals and quasi crystals We kindly ask that you cite FPS in any publication for which you found it useful, thanks! E. Saei Ghareh Naz, M.R. Jorgensen, O.G. Schmidt, Computer Physics Communications 214 (2017) 117-127.