Since 1996 I have published on the Web a catalog of data for all known globular clusters in the Milky Way. The latest edition of the Catalog is February 2003. The catalog datafile is found here:
and the bibliography (source reference file) is here:
Andres Jordan (Rutgers) has written a Web interface tool which allows you to extract any specific subset of the catalog that you want. To use it, see
A link to another database of interest for globular cluster systems in other galaxies (by Duncan Forbes):
Elizabeth Wehner has produced a catalog of magnitudes and colors in the Sloan Digital Sky Survey system (u'g'r'i'z') for the Landolt set of standard stars all around the sky. The UBVRI magnitudes from Landolt, A.U. 1992 (AJ 104, 340) have been transformed to the SDSS system with the equations given in Fukugita, M. et al. 1996 (AJ 111, 1748). The complete catalog is here.