KOHA

KOHA is a modern open source framework for library management. More details you can see on KOHA site.
Characteristics:
1. A full featured modern integrated library system (ILS).
2. MARC21 and UNIMARC for professional cataloguers.
3. RSS feed of new acquisitions.
4. Koha is multi-tasking and enables updates of circulation, cataloging and issues to occur simultaneously.
5. Tailored cataloger module for special libraries.
6. Manage online and off line resources with the same tool.
7. E-mail and/or txt patron’s overdue and other notices.
8. Serials management module.
9. Simple and comprehensive acquisition options.
10. Simple, clear search interface for all users.
11. Web based OPAC system (allows the public to search the catalogue in the library and at home).
12. Use as a document manager or digital library.
13. Print your own bar codes.
14. Full cataloger, circulation and acquisitions system for library stock management.
15. Award winning and open source no license fee, ever.
16. Linux, Unix, Windows and MacOSX platform.
17. Web Based.
18. We can full integrate it into your website.
19. Copy cataloging and z39.50.