Physicochemical Calculators - Simple online and offline calculators for boiling point at reduced pressure, unit conversion, and molecular mass. MS Tools - Online exact mass calculator, mass spectrum generator, and isotope distribution calculator. Norgwyn Montgomery Software - NGMSI sells software for 3-D molecular modeling, chemical database creation and manipulation, 2-D publication quality drawing, calculation of over 100 physical properties from structure, automatic chemical internet database generation, and QSAR and QSPR analysis as well as chemical databases. ChemBuddy - Calculators for pH, solution preparation and concentration conversion, acid-base equilibrium, buffer, hydrolysis, and dilution calculations. Laborant Chemstation - English version of German freeware data analysis program, for various calculations including stoichiometry, pH, thermochemistry, and kinetics. Chemistry Functions - Molar conversions and an interactive periodic table directly on the webpage. Requires JavaScript.