When you are downloading media on an iTunes or watching online videos on a web browser etc., this tool can often sniff out the download links of these media. You may use this tool for legal purposes only.
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.