GEISA Spectroscopic Database
Spectra for several surface types: US Geological Society Digital Spectral Laboratory
Spectra for a few more surfaces: ASTER Spectral Library
Harvard-Smithsonian Center for Astrophysics Molecular Data
NIST Chemistry WebBook
National Institute of Advanced Industrial Science and Technology Integrated Spectral Data Base System for Organic Compounds
Pacific Northwest National Labs Spectral Database
The Cologne Database for Molecular Spectroscopy CDMS
Ames Research Center Astrochemistry Lab and Infrared Spectral Database of Polycyclic Aromatic Hydrocarbons
MPI-Mainz-UV-VIS Spectral Atlas of Gaseous Molecules
Spitzer Tools (link to line lists at bottom of page)
Institute of Environmental Physics Molecular Spectroscopy and Chemical Kinetics Group
LISA database (SCOOP)
Institute of Atmospheric Optics Spectroscopy of Atmospheric Gases
Institute of Atmospheric Optics Carbon Dioxide Spectroscopic Databank
Institute of Atmospheric Optics Spectroscopy and Molecular Properties of Ozone
Centro de Fisica dos Plasmas/Instituto Superior Tecnico Gas and Plasma Radiation Database (Reference paper: Passarinho and da Silva)