We present recent advancements of the development of our DGTD solvers for computational nanophotonics, particularly for metallic nanostructures irradiated by laser pulses or electron beams. By this means, we firstly discuss the numerical treatment of a nonlocal dispersion model for the electron gas which is necessary for structures in the regime of 2 nm to 25 nm. Subsequently, we deal with the modeling of electron beams in 3D simulations for e.g. electron energy loss spectroscopy or cathodoluminescence.