WEBDA Devoted to stars in galactic open clusters. It offers an interface to a database collecting astronomical observations, and bibliography. http://obswww.unige.ch/webda/

Astronomical Data Center Data from the National Astronomical Observatory of Japan. Includes catalog service, data archives, imaging services, and journals. http://adac.mtk.nao.ac.jp/

ADC - Astronomical Data Center NASA's ADC is a resource for astronomical data, catalogs, and journal tables. http://adc.gsfc.nasa.gov/

CATS Database Astrophysical CATalogs support System. Contains list of catalogs, table of major radio catalogs, and search tool. http://cats.sao.ru/

CADC - Canadian Astronomy Data Centre Contains digitized sky survey, IUE archive, star catalogs, and links. http://cadcwww.dao.nrc.ca/CADC-homepage.html

SAO Telescope Data Center Creates, and maintains software to process and archive data from optical telescopes at the Oak Ridge Observatory in Harvard, Massachusetts, Whipple Observatory, and Multiple Mirror Telescope on Mt. Hopkins in Arizona. The Smithsonian Astrophysical Observatory (SAO) is part of the Harvard- Smithsonian Center for Astrophysics (CfA) in Cambridge, Massachusetts. http://cfa165.harvard.edu/

NCSA Astronomy Digital Image Library (ADIL) collects astronomical, research-quality images and make them available to the astronomical community, and the general public. Offers Library access, image browse, and FITS links. http://imagelib.ncsa.uiuc.edu/imagelib.html

The UTR-2 Catalogue Provides a low frequency sky survey of discrete sources obtained in the Institute of Radio Astronomy of the Ukrainian National Academy of Sciences. Images from the UTR-2 radio telescope at a number of the low frequencies used in contemporary radio astronomy within the range from 10 to 25 MHz. http://www.ira.kharkov.ua/UTR2/

The Aladin Sky Atlas Provides an interactive sky atlas allowing users to visualize digitized images of any part of the sky. Includes astronomical catalogs, personal user data files, and interactive access to related data from the Simbad database, and Vizier service. http://aladin.u-strasbg.fr/

Centre de Données astronomiques de Strasbourg (CDS) Astronomical databases, bibliography, documentation, and directory. http://cdsweb.u-strasbg.fr/CDS.html

Multiwavelength Milky Way The Astrophysics Data Facility (ADF), located at the NASA Goddard Space Flight Center. http://adc.gsfc.nasa.gov/mw/milkyway.html

CFHT Archive The Canada-France-Hawaii Telescope Archive. Includes CFHT archives, images, instruments, help, and links. http://cadcwww.dao.nrc.ca/cfht/cfht.html

DSS - The Digitized Sky Survey Comprises a set of all-sky photographic surveys in E, V, J, R, and N bands conducted with the Palomar, and UK Schmidt telescopes at the Space Telescope Science Institute. http://stdatu.stsci.edu/dss/

The VLA FIRST Survey Faint images of the radio sky at the wavelength of 20 centimeters. http://sundog.stsci.edu/

ESO/ST-ECF USNO-A1.0 Catalogue Server Archive provides access to the all-sky catalogue from the set of ten CD-ROMs produced by the US Naval Observatory within the Precise Measurement Machine Project. http://archive.eso.org/skycat/servers/usnoa

Starcast Provides simultaneously queries, and many astronomical databases. Includes input target coordinates or name, data type, source, and bandpass. http://archive.stsci.edu/starcast/

Technical Data for the Arecibo Airglow and Optical Instrumentation Data information, and instrument documentation from the Arecibo optical facility. http://www.naic.edu/usrweb/tech/optical-.htm

SIMBAD Astronomical Database Offers data, cross-identifications, observational measurements, and bibliography for celestial objects outside the solar system including stars, galaxies, and nonstellar objects within our galaxy, or in external galaxies. http://cdsweb.u-strasbg.fr/Simbad.html

Personal Web pages A list of the personal web pages of professional astronomers from around the world. Extensive. http://www.cv.nrao.edu/fits/www/yp_personal.html

MAST: Multimission Archive at STScI MAST supports a variety of astronomical data archives, with the primary focus on scientifically related data sets in the optical, ultraviolet, and near-infrared parts of the spectrum. http://archive.stsci.edu/