SERef (short for "Search Engine Reference") is a library that can extract the search terms that a person used to find a Web page in a search engine. These terms are extracted from the referrer information included in the HTTP request for a Web page.
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.
