Abell Catalog of Galaxy Clusters @ http://heasarc.gsfc.nasa.gov/W3Browse/all/abell.html

ARP's  Catalog of  Peculiar Galaxies @ http://members.aol.com/arpgalaxy/

ARP's Atlas of Peculiar Galaxies @ http://nedwww.ipac.caltech.edu/level5/Arp/Arp_contents.html

ARP Galaxies in the Revised Shapley-Ames Catalog @ http://users.aol.com/arpgalaxy/rsaarp.html

Binary Star Catalogs @ http://www.physics.sfasu.edu/astro/binstar.html

Caldwell Catalog @ http://seds.lpl.arizona.edu/messier/xtra/similar/caldwell.html

Deep Sky Collections & Catalogs @ http://seds.lpl.arizona.edu/messier/xtra/similar/catalogs.html

Double Star Library @ http://ad.usno.navy.mil/wds/dsl.html

Draper Star Catalog @ http://www.willbell.com/software/hypersky/hd.htm

Fourth Catalog of Orbits of Visual Binary Stars @ 
http://ad.usno.navy.mil/star/ORBITS/WDS_ORBT.HTM

General Catalog of Variable Stars @ http://www.sai.msu.su/groups/cluster/gcvs/gcvs/

Globular Cluster Catalog @ http://www.asc.rssi.ru/mdb/stars/7/7013.htm

Guide Star Catalog @ http://www-gsss.stsci.edu/gsc/GSChome.htm

Herschel Catalog @ http://www.seds.org/messier/xtra/similar/herschel.html

Hipparcos Catalog @ http://astro.estec.esa.nl/SA-general/Projects/Hipparcos/hipparcos.html

Irregular Galaxies @ http://seds.lpl.arizona.edu/messier/irre.html

Large Bright Quasars Survey (LBQS) @ http://heasarc.gsfc.nasa.gov/W3Browse/all/lbqs.html

List of Stars in Bright Star Catalog Order @ http://www.astro.wisc.edu/~dolan/constellations/star_list.html

Major Solar System Planets and Moons @ http://www.deepspace.ucsb.edu/ia/nineplanets/nineplanets.html

Messier (M) Catalog @ http://seds.lpl.arizona.edu/messier/

Messier Galaxies in the ARP Catalog @ http://seds.lpl.arizona.edu/messier/xtra/supp/m-arp.html

Morphological Catalog of Distant Clusters @
http://cdsaas.u-strasbg.fr:2001/ApJ/journal/issues/ApJS/v110n2/34990/34990.html

Morphological Cataloge of Galaxies @ http://www.willbell.com/software/hypersky/mcg.htm

NGC (New General Catalog) @ http://seds.lpl.arizona.edu/~spider/ngc/ngc.html

NGC Image Catalog @ http://www.frostydrew.org/transfer/fullngc.htm

NGC & Index Catalogs @ http://www.ngcic.com/ngciccat.htm

PMM Catalogs @ http://www.nofs.navy.mil/projects/pmm/catalogs.html

SAO Catalog @ http://tdc-www.harvard.edu/software/catalogs/sao.html

SDSS @ http://www.tigr.org/~salzberg/murthy_thesis/node47.html

SEDS - Galaxies @ http://seds.lpl.arizona.edu/messier/galaxy.html

Southern Peculiar  Galaxies and Associations @ http://nedwww.ipac.caltech.edu/level5/SPGA_Atlas/frames.html

Stellar Catalogs @ http://www.tass-survey.org/tass/catalogs/catalogs.html

The 50 Brightest Stars @ http://www.cosmobrain.com/cosmobrain/res/brightstar.html

The Washington Double Star Catalog @ http://ad.usno.navy.mil/wds/wds.html

Uppsala Galaxy Catalog @ http://www.willbell.com/software/hypersky/ugc.htm

Yale Bright Star Catalog (BSC5) @ http://amase.gsfc.nasa.gov/amase/MissionPages/YALEBSC.html

CELESTIAL COORDINATE SYSTEM

Celestial Geometry @ http://web.mit.edu/8.13/JLExperiments/expt46/node13.html

International Celestial Reference System @ http://aa.usno.navy.mil/faq/docs/ICRS_doc.html

Introduction to Celestial Coordinates and the Planisphere @ http://www.exodusproject.com/ASTR111/lab1.htm

SOFTWARE or SERVER ACCESS:

Standard Celestial Object Databases @ http://www.bisque.com/products/TheSky/Databases.asp

Sky Commander @ http://www.skyeng.com/catalogs.htm

SkyServer @ http://skyserver.sdss.org/en/sdss/skyserver/

Software for Management of  Astronomical Images and Catalogs @ http://www.astronomysite.com/mapug/11/msg11322.htm