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dotNetRDF is a RDF, SPARQL and Semantic Web API written in C# for .Net 3.5 and higher It provides an object model for manipulating RDF and querying it using SPARQL. Additionally it supports a variety of popular triple stores including 4store, Sesame and Virtuoso.
HyperGraphDB is a general purpose, open-source data storage mechanism based on a powerful knowledge management formalism known as directed hypergraphs. While a persistent memory model designed mostly for Knowledge management, Artificial Intelligence and Semantic web projects, it can also be used as an embedded object-oriented database for Java projects of all sizes. It could also be used as graph database or as (non-SQL) relational database.
Semantic MediaWiki is an extension to the MediaWiki software (powering Wikipedia), which extends the Wiki with ideas from the Semantic Web. We focus on usability and tight integration. See the web site for further details.
NotaBene RDF Annotation Tool is a wxPython graphical user interface. Its primary purpose is to ease the use of RDF to manually annotate electronic XML editions of left-to-right-written texts. It allows multiple views of the annotated document.
Soprano (formerly known as QRDF) is a library which provides a highly usable object-oriented C++/Qt4 framework for RDF data. It uses different RDF storage solutions as backends through a simple plugin system. Soprano is targetted at desktop applications
The dotSesame project is a C# port of the Sesame project, which is originally written in Java. It is an open source RDF database with support for RDF Schema inferencing and querying. Full documentation of Sesame can be found at http://www.openrdf.org/
This is the official collaborative development environment of the Large Knowledge Collider (LarKC), a platform for massive distributed reasoning that aims to remove the scalability barriers of currently existing reasoning systems for the Semantic Web