In the course of my diploma thesis, I evaluated the performance of several RDF stores when small pieces of information are requested from a large dataset (DBpedia infoboxes plus two very small sets). The benchmark queries employ varying levels of joins and constraints.

Soprano is a Qt-based pluggable framework for RDF storage and parsing. It tries to provide a highly usable interface to several RDF storage solutions. Overview Soprano centers around the Soprano::Model class which represents one storage set. A Soprano::Model is basically a set of RDF quadruples, i.e. Soprano::Statement. The actual storage is done via Soprano::Backend plugins. All query operations return Soprano::Iterator instances. Iterator is a explicitely shared class which is very easy to understand and use. Soprano makes the distinction between two types of Models: Soprano::StorageModel and Soprano::FilterModel. The former one is intended to be the basic Model which actually stores the data while the latter ones can be stacked on top of a Soprano::StorageModel to perform certain filter operations. Thes filter operations can range from very basic things such as disallowing any write operation (Soprano::Util::ReadOnlyModel) to more complex things such as full text indexing of all literal statements (Soprano::Index::IndexFilterModel) or exporting the Model via D-Bus (Soprano::Server::DBusExportModel). Apart from storage Soprano provides a system for RDF parser and serializer plugins. For more details on parsing or serializing RDF data see the Soprano::Parser and Soprano::Serializer classes. Soprano comes with a builtin Server and Client implementations allowing to build remote repositories quickly. Soprano::Client::SparqlModel provides a client to arbitrary SPARQL (SPARQL Protocol and RDF Query Language) Http services.

Virtuoso is an innovative Universal Server platform that delivers an enterprise level Data Integration and Management solution for SQL, RDF, XML, Web Services, and Business Processes. Its unique hybrid server architecture enables it to delivery traditionally distinct server functionality, within a single product offering, along the following lines: * Data Management & Integration (SQL, XML and RDF) * Application Integration (Web Services & SOA) * Process Management & Integration (BPEL) * Collaboration and Network Effects

Freebase is an open database of the world’s information. "Open" means it's built by the community, for the community — anyone can contribute information, create collections of information to share with others, or build applications that use our API. It also means that the database is freely, openly licensed. Freebase already contains millions of facts in dozens of categories spanning people, locations, books, movies, music, companies, science, sports, and more, and is growing daily, thanks to the efforts of a passionate, global user community. For licenses see: http://www.freebase.com/signin/licensing

IMDBPHP provides an API (Application Programmers Interface) to the movie information stored at the IMDB.COM site. As this and the name suggests, it is primarily targeted at PHP programmers who want to extend their programs or their site with these movie information. IMDBPHP is Open Source and protected by the GPL.

Quote "A multimedia server optimized for storing massive collections of large, scientific data and related metadata and reports". As used by the Optical Society of America.

A database of funders (mainly foundations) supporting journalism publishing.

SQL Examiner makes database development, maintenance, and hot-fixing simpler. The SQL compare engine enables MS SQL Server developers to synchronize database structures between development and production servers while preserving existing data.

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