More information on the Competitive Fragmentation Modeling method and this web server can be found in the following publications:

Allen F, Greiner R, and Wishart D. Computational prediction of electron ionization mass spectra to assist in GC-MS compound identification. Submitted, 2016.
Supporting Data: https://sourceforge.net/p/cfm-id/code/HEAD/tree/supplementary_material/2016_ei_ms_paper/

Allen F, Greiner R, and Wishart D. Competitive fragmentation modeling of ESI-MS/MS spectra for putative metabolite identification. Metabolomics. June 2014.
Supporting Data: https://sourceforge.net/p/cfm-id/code/HEAD/tree/supplementary_material/2015_esi_msms_paper/

Allen F, Pon A, Wilson M, Greiner R, and Wishart D. CFM-ID: a web server for annotation, spectrum prediction and metabolite identification from tandem mass spectra. Nucleic Acids Res. June 2014.

Windows executables and cross-platform source code are freely available at http://sourceforge.net/projects/cfm-id. Supplementary files containing test molecule lists and trained models are also available on that site.