ftp.proxy is an application level gateway for FTP. It allows either forwarding to a specific host or optional client side server selection w/o allowed host list, access and command control trough external programs.
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.