K15 is the KDE version of the fifteen game. It allow you, the user, to select background images for pieces and field, and is fully customizable. It's released translated in Italian and English.
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.
