undvd is dvd ripping made *simple* with an easy interface to mencoder with sensible default settings that give good results. For those times you just want to rip a movie and not consider thousands of variables.
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.