VideLibri will watch over the books you have lend in public libraries. It will automatically extend the loan period, warn you if some are due, and keep a history of all lend books. It only supports a few German libraries, but you can add your own.
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.