VALD
VALD (the Vienna Atomic Line Database) is a collection of atomic and molecular transition parameters of astronomical interest. It provides the data necessary for line opacity calculations and for spectral synthesis. VALD offers tools for selecting subsets of lines for typical astrophysical applications: line identification, preparing for spectroscopic observations, chemical composition and radial velocity measurements, model atmosphere calculations etc. Further information and registration form can be found at vald.astro.uu.se.