An overview over references for Raman spectra and mineral-related databases
The RRUFF database of Raman spectra, X-ray diffraction and chemistry of minerals
Programs and spectra from John Bertie (quantitative IR spectra of liquids, incl. water)
Database of UV/VIS optical constants of solid materials at Ioffe institute
Luxpop.com, another website with optical constants
Lasurface.com - Reference data for XP and Auger spectra
XPSsimplified, a starting point for XPS data interpretation
Search for IR, NMR and mass spectral signals
Calculates isotope distribution in mass spectra
ChemoSpec, an R package for exploratory chemometrics in spectroscopy