Library database ?

I'm looking for a library database.

The system we are using is called WINISIS which is a system which was
developed by the UN under the name CDS-ISIS.

I'm looking for something which is GPL or low cost, and has a real backend
database like PG or other to allow query via web forms.

Cheers.

Franck Martin
Network and Database Development Officer
SOPAC South Pacific Applied Geoscience Commission
Fiji
E-mail: franck@sopac.org.fj <mailto:franck@sopac.org.fj>
Web site: www.sopac.org.fj <http://www.sopac.org.fj&gt;