Proteomics Server:
http://www.expasy.ch/
Proteomics Tools:
http://prospector.ucsf.edu/
Peptide Mass Finder:
http://prowl.rockefeller.edu/prowl-cgi/profound.exe;
http://prospector.ucsf.edu/prospector/cgi-bin/msform.cgi?form=msfitstandard
Mascot Search:
http://www.matrixscience.com/search_form_select.html
Molecular Weight Calculator:
http://www.alchemistmatt.com/
Molecular Fragment Calculator:
http://home.pacbell.net/jdeline/
Isotopic Abundances of the Elements:
http://www.sisweb.com/mstools.htm
Isotope Distribution Calculator and Mass Spec Plotter:
http://www2.sisweb.com/mstools/isotope.htm
Periodic chart of elements (with chemical properties, health and environmental effects):
http://www.lenntech.com/periodic-chart.htm
Mass Finder... calculates the masses of ions for a given peptide sequence. Online-Calculation:
http://www.colby.edu/chemistry/NMR/scripts/peptide.html
Isotope Cluster... calculates the isotope pattern for a given molecular formula. It includes 3rd and 4th period representative and transition metal elements. Online-Calculation:
http://www.colby.edu/chemistry/NMR/IsoClus.html