I would use the simple software Winbeam. This is an excellent tool for calculating max. moment etc. on beams with any kind of loadings. - Well, this can give the deflection, if the stiffness factor is correct inserted. Normally I don't use this program to calculate deflection - but it is possible as far as I know. I have a quite old version of the program - maybe a new version have even better features for calculating deflection.