JabRef is an open source application that helps you manage references in bibliographies like books, articles, manuals, conferences, dissertations, brochures, etc. JabRef uses BibTeX, the standard LaTeX bibliography format.
JabRef lets you group your references by keyword, find references with search patterns, add your own fields, etc.
For Mac OS X 10.2 or later. Requires Java version 1.4.2.