Open Upload is an open source extensible PHP application for fast file upload and download for big (and small) file sharing, like rapidshare and megaupload. Multiple authentication methods, database backends, multilanguage support.
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.