Kat is an open source framework designed to allow KDE applications to index and retrieve files. Metadata, fulltext and thumbnails are extracted from documents, images, mp3 and other media allowing quick and accurate information retrieval.
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.