NASA/IPAC Extragalactic Database (NED)
Lists names and positions of extragalactic objects and provides links to data and published literature related to each object.
nedwww.ipac.caltech.edu
Starburst99
Comprehensive data analysis tool for professional scientists. Site allows users to retrieve models of synthetic properties of star-forming galaxies.
www.stsci.edu/science/starburst99