• Multi-Mission Archive at STScI (http://archive.stsci.edu/), in the Tools section
• Virtual Astronomical Observatory, as part of the Iris project (SED Access and Analysis) (http://dev.usvao.org/vao/wiki/Projects2010/SEDAccessAnalysis)
• StarView (http://starview.stsci.edu/html/)
• Canadian Astronomy Data Center HST archive (http://cadcwww.dao.nrc.ca/hst/)
• ESTEC / GAIA synthetic spectral library (http://gaia.esa.int/spectralib/)
• ESTEC/GAIA engineering parameter database
• AVO Science demo (http://www.euro-vo.org/twiki/bin/view/Avo/UsingSpecview) (http://www.euro-vo.org/twiki/bin/view/Avo/ExtragalacticScenario)
• Aladin (http://aladin.u-strasbg.fr/aladin.gml)
• Optical Properties, Electronic Structure and Electrodynamics Site @ University of Pennsylvania (http://www.lrsm.upenn.edu/~frenchrh/spectraldata.htm)
• NASA/IPAC Extragalactic Spectra Database (http://nedwww.ipac.caltech.edu/forms/SearchSpectra.html)