SDSSIDL
SDSSIDL is a set of general IDL utilities for plotting, data analysis, and database access. The distribution includes C/C++ extensions for postgres database interface, efficient file input/output, efficient ra/dec searching using HTM.
There are many routines for working with Sloan Digital Sky Survey Data, especially the 'flat files' and characterization of the survey area.
See the README, CHANGES.txt and AUTHORS files for the latest svn version.
News:
2009-07-22: Version 1.5.0 released. See the Change log
2008-09-17: Version 1.4 released See the Change log