SimTandem is a freely available tool for identification of peptides from LC-MS/MS spectra. It is based on a similarity search of mass spectra in a database of theoretical spectra generated from a database of known protein sequences.
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Jiri Novak, Timo Sachsenberg, David Hoksza, Tomas Skopal and Oliver Kohlbacher.
On Comparison of SimTandem with State-of-the-Art Peptide Identification Tools, Efficiency of Precursor Mass Filter and Dealing with Variable Modifications.
Journal of Integrative Bioinformatics, 10(3):228, 2013.