BiblioteQ - Open Source Catalog Software and Library Management Suite

http://biblioteq.sourceforge.net/index.html
from the website it says:

"BiblioteQ strives to be a complete and thorough library management suite. The application is supported on numerous platforms, including FreeBSD, Linux, OS X, Solaris and Windows. Installers are available for OS X and Windows.

For some categories, BiblioteQ provides a mechanism for querying the Library of Congress, or any other Z39.50-capable system, via the standard Z39.50 protocol; thus simplifying the data-entry process.

As for database support, BiblioteQ allows for connectivity to both PostgreSQL and SQLite database engines. "

Will give this a whirl.

‡biblios.net | Cataloging productivity suite

http://biblios.net
LIS 160 peeps as well as those with cataloging subjects may find this useful, if not interesting.

It's a web-based cataloging client running on Google Gears which supports copy and original cataloging. You can search millions of freely licensed records and share your records with other libraries. MARC21 and MARCxml support too.

Bumped into this c/o @prexmol who's doing work for Kabaka Lib.