mod_okioki is an Apache HTTPD module that makes it easy to define a RESTful data service in combination with a PostgresQL database. Definition of a service consists of pairing an URL with an SQL statement in the Apache configuration file.
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.