SAFiCF is a simulated annealing fitting program to fit Crystal Field parameters to inelastic neutron scattering data.
It is written for the Matlab environment, and you can download it here. You will need Matlab 7 R14 or newer, or alternatively, the non-graphical parts of it will work in the GNU Octave environment, which is available freely. (Update: Jan 2015) There is now a rudimentary GUI, but the program is still best run from a script or the commandline.
The simulated annealing fitting algorithm used is that of Corana, Marchesi, Martini, and Ridella, ACM Trans. Math. Software 13 262-280 (1987)
The manual is available in the zip archive, or separately here: (pdf|html).