Mod_auth_kerb is a module that provides Kerberos user authentication to the Apache web server. It allows to retrieve the username/password pair, and also supports full Kerberos authentication (also known as Negotiate or SPNEGO based authentication).
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.