RPMbuilder is a program to help users create RPMs from a source .tar.gz package. It helps build a generic RPM spec file. Although this program will bail out on nonstandard build methods, it should be good enough for most apps.
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.