Metadesk RDF authoring tool

from ISI, USA. An authoring tool emphasising entry of facts, rather than construction of ontologies. MS Windows only binary (Java jars and DLLs). License: unknown
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NG4J - Named Graphs API for Jena

by Chris Bizer. An extension to the Java Jena Semantic Web framework for parsing, manipulating and serializing sets of Named Graph. Includes APIs for named graph operations, readers, writers and parsers and serializers for the TriG and TriX formats. See also the Named Graph Paper (PDF) and the sourceforge project for downloads. License: BSD. Version 0.4 announced
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pOWL Semantic Web Development Platform

by Sören Auer. A PHP toolkit for the semantic web consisting of the RAP RDF API, RDFS and OWL support from pOWL including editing and querying with RDQL and full-text, multiple languages, versioning support, plug-ins and a web application framework. License: GPL. Version 0.8 released
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SMART: System for Managing Applications based on RDF Technology

by Andrey Guskov and Vladimir Shraibman. An application to aid the creation of documents described with RDF, implemented as Java servlets using Jena and GraphViz (optionally). License: unknown. Version 1.5.2 released
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Ontaria

by Sandro Hawke. A web-based browser for ontologies and other RDF data. First announced
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RDF Gateway

by Intellidimension - a semantic web platform for MS Windows XP/NT/2000 allowing managing of data as RDF including an application server, web server and deductive RDF database. The main features are an SQL-style RDF query language, inference engine, datatypes, full text search, application development environment with ASP-like server pages, integration of many external data sources, web and non-web interfaces. Commercial application with 60-day evaluation version. Version 2.1 with many changes announced
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Swoogle

crawler-based indexing and retrieval service for the semantic web from Tim Finin, UMBC, USA
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RAP - RDF API for PHP

by Chris Bizer. A pure PHP package for manipulating RDF models, querying them with RDQL, parsing/serializing the RDF/XML, N3 and N-Triples syntaxes and providing a network server for NetAPI. See also the online demo. License: GPL. Version 0.8.1 with speed improvements, improved indexing and searching, new unit test suite and other bug fixes announced
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VIVID (Visual Variable-depth Information Display)

browser for OWL and RDF using densely-packed presentations by Baoshi Yan, ISI, USA. License: unknown. Version 1.01 announced
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RDFStore Perl/C RDF API and Storage

by Alberto Reggiori. A system for managing RDF model databases, storing them in databases, natively, free-text searching and indexing, parsing and serialising, querying with RDQL. See also the demos, native store description and downloads area. Version 0.50 with major rewrite into mostly C, new native store and indexing model announced
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