PSRCAT - The Australia Telescope National Facility Pulsar Database. A searchable database of pulsars, with the option of displaying a large number of variables.
EPN - The European Pulsar Network Data Archive. Display and download EPN and ASCII data files and display GIF images of pulse profiles over different wavelengths.
SNR - The Supernova Remnant Catalogue. Positions, sizes, brightnesses, spectral indices, types and references for 231 SNRs.
Globular Clusters - text file containing a tabular list of globular cluster properties
Pulsars in Globular Clusters - HTML file containing a tabular list of pulsars in globular clusters.
SIMBAD - general astronomical software database search engine.
Multiwave - an all-sky imaging service producing pictures from radio to gamma-ray wavelengths.
HEASARC - searchable catalogue of high-energy sources from various missions (ASCA, BeppoSAX, Chandra, ROSAT, RXTE, XMM-Newton, CGRO).