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Jena is Java toolkit for developing semantic Web applications. It includes an RDF API, an OWL API, SPARQL 1.1 implementation. jena support readign and writing RDF/XML, Turtle, N-triples, TriG and N-Quads as well as other formats. Storage options include in-memory, a high-performance native store as well as adapters for SQL databases.
Semantic MediaWiki (SMW) is an extension of MediaWiki – the wiki-system powering Wikipedia – with semantic technology, thus turning it into a semantic wiki.
OntoWiki is a Semantic Data Wiki as well as an Application Framework providing support for agile, distributed knowledge engineering scenarios.
The OWL API is a Java interface and implementation for the W3C Web Ontology Language OWL. The latest version of the API is focused towards OWL 2 which encompasses, OWL-Lite, OWL-DL and some elements of OWL-Full.
An extensive update of Borland's Object Windows Library (OWL) for writing GUI applications in standard C++ on Microsoft Windows.
GNOWSYS, Gnowledge Networking and Organizing System, is a web based hybrid gnowledge base with a kernel for semantic computing. It is developed in Python and works as an installed product in ZOPE.
LinqToRdf provides a full-featured LINQ query provider for .NET using both local triple stores with Graph Matching and SPARQL queries on remote stores. It also provides graphical design tools for visual studio 2008 that provide a UML style design surface for the production of both ontologies and .NET domain models.
DL-Learner is a tool for learning concepts in Description Logics (DLs) from user-provided examples. Equivalently, it can be used to learn classes in OWL ontologies from selected objects.