• Atomic Isotope Masses
• Atomic Weights
• Amino Acid Residue Mass
• Amino Acid Structures
• Carbohydrate Masses
• Common Calibrant Masses
• Common Neutral Losses
• Nucleoside Mass

• Ion Formula by Mol. Weight
• Isotope Pattern Calculator
• Mass Loss Calculator
• Periodic e-Table

• EMBL Peptide Search - protein ID from peptide mass and sequence data
• FindMod - post-translational modifications by peptide mass
• GlycanMass - oligosaccharide mass from structure
• GlycoMod - oligosaccharide structures from mass
• Javascript Protein Digest - peptide digest masses
• Javascipt Fragment Ion Generator for peptides
• Mascot Search - peptide mass and sequence tools
• Mowse - protein identification from peptide MS data
• Protein Prospector - mass spectra interpretation tools
• PROWL - identification of proteins from MS data

Average (isotope weighted) and monoisotopic masses (C-12 only) for common monosaccharides and additional groups are shown below.

• Academic Press
• amazon.com
• American Chemical Society
• Barnes & Noble
• Humana Press
• Royal Society of Chemistry
• Wiley Interscience

• European Mass Spectrom.
• Intl. J. of Mass Spectrom.
• J. American Society of MS
• J. Mass Spectrometry
• J. MS Society of Japan
• Mass Spectrometry Reviews
• Rapid Communications in MS

• Beilstein Abstracts
• ChemWeb
• Current Contents - ISI
• PubMed - NCBI
• PubScience - DOE