The following computer programs for stopping power are available on the internet:

PSTAR and ASTAR by M.J.Berger for protons and alphas.

MSTAR by H.Paul and A.Schinner for ions from Li to Ar. This program, with instructions for use, can be downloaded from here. The program's accuracy can be judged from the section on statistical analyses.

SRIM by J.Biersack and J.F.Ziegler for all ions. See my  list of programs for remarks about the year-to-year changes of Ziegler's programs.

ATIMA by H.Geissel and C.Scheidenberger.

CasP by P.L.Grande and G.Schiwietz for all ions.

For a critical comparison of some of these programs with experimental data, see Statistical Analyses