Twinkle Twinkle is a simple GUI interface that wraps the ARQ SPARQL query engine. The tool should be useful both for people wanting to learn the SPARQL query language as well as those doing Semantic Web Development. Swoogle A semantic search engine covering over 10.000 ontologies WordNet Browser Simple GUI for query-ing the WordNet installed into Sinux. WordNet is a large lexical database of English developed under the direction of George A. Miller. Nouns, verbs, adjectives and adverbs are grouped into sets of cognitive synonyms (synsets), each expressing a distinct concept. Synsets are interlinked by means of conceptual-semantic and lexical relations. The resulting network of meaningfully related words and concepts can be navigated with the browser. WordNet is also freely and publicly available for download. WordNet's structure makes it a useful tool for computational linguistics and natural language processing. Frameworks and libraries Java Developer Kit + Java Runtime Environment Software Development Kit and Java Runtime for creating and running java applications. Applications written in java can be executed in most operating systems nowadays including Windows, Linux, Mac OS X, Solaris, etc. Jena Jena is a java framework for building Semantic Web applications. It provides a programmatic environment for RDF, RDFS and OWL, SPARQL and includes a rule-based inference engine. The Jena Framework includes: A RDF API Reading and writing RDF in RDF/XML, N3 and N-Triples An OWL API In-memory and persistent storage SPARQL query engine PHP-RAP RDF API for PHP. RAP is a software package for parsing, searching, manipulating, serializing and serving RDF models. Its features include: statement-centric methods for manipulating an RDF model as a set of RDF triples resource-centric methods for manipulating an RDF model as a set of resources ontology-centric methods for manipulating an RDF model through vocabulary specific methods quad- and named graph-centric methods for manipulating RDF datasets integrated RDF/XML, N3, N-TRIPLE, TriX, GRDDL, RSS parser integrated RDF/XML, N3, N-TRIPLE, TriX serializer in-memory or database model storage SPARQL query engine supporting all features of the W3C SPARQL Recommendation SPARQL client library RDQL query engine inference engine supporting RDF-Schema reasoning and some OWL entailments integrated RDF server providing similar functionality as the Joseki RDF server integrated linked data frontend graphical user-interface for managing database-backed RDF models support for common vocabularies drawing graph visualizations Redland Redland is a set of free software C libraries that provide support for the Resource Description Framework (RDF). Modular, object based libraries and APIs for manipulating the RDF graph, triples, URIs and Literals. Storage for graphs in memory and persistently with Sleepycat/Berkeley DB, MySQL 3-5, PostgreSQL, AKT Triplestore, SQLite, files or URIs. Support for multiple syntaxes for reading and writing RDF as RDF/XML, N-Triples and Turtle Terse RDF Triple Language, RSS and Atom syntaxes via the Raptor RDF Parser Library. Querying with SPARQL and RDQL using the Rasqal RDF Query Library. Data aggregation and recording provenance support with Redland contexts. Language Bindings in Perl, PHP, Python and Ruby via the Redland Bindings package. Command line utility programs rdfproc (RDF), rapper (parsing) and roqet (query). Portable, fast and with no known memory leaks. Soprano 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 that need a RDF data storage solution. It has been optimized for easy usage and simplicity.