OpenFakt is an open source Java invoicing and billing system using XML definition files for various forms (address book, articles, invoices, stock management). It is language, database and platform independent and aims at small to big companies.
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.