The Hipparcos Catalogue - http://archive.ast.cam.ac.uk/hipp/hipparcos.html The Hipparcos Catalogue
White Dwarf Database - http://procyon.lpl.arizona.edu/WD/ An electronic database of the white dwarf stars.
Catalog of White Dwarf Stars McCook and Sion - http://www.willbell.com/software/hypersky/wd1987.htm A catalog of spectroscopically identified white dwarf stars, by George P. McCook and Edward M. Sion
The 50 Nearest Stars - http://www.cosmobrain.com/cosmobrain/res/nearstar.html Table with details about the 50 nearest stars. Names, distances, constellations, spectral types, magnitudes and coordinates.
Astrometric holdings in ADC Archives - http://adc.gsfc.nasa.gov/adc/adc_cat1_holdings.html Data sets in the Astronomical Data Center's Astrometric, and Positional data holdings. Contains site map, science data, news, and feedback.
The Hipparcos Space Astrometry Mission - http://www.rssd.esa.int/Hipparcos/ European Space Agency's Hipparcos mission. Research tools, news, catalogues, education resources, and data.
The Double Star Library - http://ad.usno.navy.mil/wds/dsl.html The Double Star Library hopes to be a means by which various types of binary and multiple star information can be easily disseminated among binary star astronomers in IAU Commission 26 and related commissions.
USNO PMM Star Catalogs - http://www.nofs.navy.mil/projects/pmm/catalogs.html USNO is making the USNO-SA2.0 catalog (54,787,624 stars in all on one CD-ROM) available for free. The full USNO-A2.0 catalog (526,230,881 stars on 10 CD-ROMs) is also available provided you can provide a brief explanation of why USNO-SA2.0 is not sufficient. That's information on over half a billion stars!
A New Reduction of the Hipparcos Catalogues - http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=41375 ESA announcement of a recalculation of the data which improves accuracy by compensating for systematic errors of thermal and micrometeoritic origin.
Nstars Online Spectra - http://stellar.phys.appstate.edu A spectroscopic survey of 3600 nearby stars within 40pcs earlier than M0. Contains real-time spectral plots, and coordinate lists. Also MK standards.
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