Jena Semantic Web Toolkit
- A Java system for RDF providing support for manipulating RDF models, parsing RDF/XML and N3, persistent storage with Sleepycat DB and many SQL backends, querying using RDQL and inference support.
- http://www.hpl.hp.com/semweb/tools.htm

Redland - An RDF Application Framework
- A C library that provides an implementation of the RDF model, allowing it to be manipulated, queried and stored via APIS in Perl, Python, Tcl and Java.
- http://librdf.org/

Rx4RDF
- Information on this application stack for building RDF-based applications. Also has details on Rhizome which is a Semantic Web-enabled, Wiki-like content management system.
- http://rx4rdf.liminalzone.org/

Sesame: RDF Schema Querying and Storage
- An RDF Schema-based Repository and Querying facility. Supports expressive querying of RDF data and schema information using an OQL-style query language called RQL. The site has demos of the storage facility and the query engine.
- http://www.openrdf.org/

ARP: Another RDF Parser
- A modern Java based RDF/XML parser compliant with latest XML and RDF updates including validation of many syntax aspects.
- http://www.hpl.hp.com/personal/jjc/arp/

BlogPlanet
- Allows for reading RSS/RDF/Atom-Feeds any Java-enabled mobile phone.
- http://www.blogplanet.net/

Mozquery
- This tool uses ASRDF, a terse notation based on the outliner scheme, to convert RDF statements in full RDF-XML syntax with support for data typing and i18n.
- http://mozquery.mozdev.org

ICS-FORTH RDFSuite
- A suite of high-level, scalable tools for the Semantic Web. Comprises of VRP, the Validating RDF Parser, RSSDB, the RDF Schema Specific DB and an Interpreter for RQL, the RDF Query Language
- http://athena.ics.forth.gr:9090/RDF/

RDF API for PHP (Bizer)
- A pure PHP library for parsing, manipulating and serializing RDF.
- http://sourceforge.net/projects/rdfapi-php/

KAON Semantic Web toolkit
- A comprehensive Java RDF and Semantic Web toolkit with parsing, persistent storage, inferencing and querying.
- http://kaon.semanticweb.org/

PerlRDF
- Parser, storage, and query language for RDF.
- http://www.gingerall.cz/charlie/ga/xml/p_rdf.xml

Wilbur Lisp RDF Toolkit
- A toolkit for RDF and DAML written in Common Lisp providing model manipulation and parsing of RDF/XML.
- http://wilbur-rdf.sourceforge.net/

CARA Perl RDF API
- A pure perl RDF system providing storage and RDF/XML parsing.
- http://cara.sourceforge.net/

RDFStore - Perl API for RDF Storage
- A pure perl RDF API providing storage, querying and manipulation of RDF models and parsing of RDF/XML.
- http://rdfstore.sourceforge.net/

SiRPAC - Simple RDF Parser & Compiler
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- http://www.w3.org/RDF/Validator/

FRODO RDFSViz
- A visualization tool for RDF Schema ontologies.
- http://www.dfki.uni-kl.de/frodo/RDFSViz/

RDFDB: An RDF Database
- An implementation of a full RDF system including parsing of XML syntax, storage, model, query language and a server interface.
- http://www.guha.com/rdfdb/

Redfoot Python RDF Framework
- Redfoot is a framework for building distributed, data-driven web applications with RDF and Python. It includes a database, parser, serializer, query API, template language for web-sites, modular architecture and some peer-to-peer support.
- http://redfoot.net/

RDF Gateway by Intellidimension
- A semantic query service for distributed data. The gateway gives applications the ability to perform powerful deductive queries across multiple sources of structured data. Applications interface with the gateway through a simple, SQL-style language (RDFQL
- http://www.intellidimension.com/

Web Resource Application Framework
- A perl system implementing the RDF API using it for describing the data, interface and code.
- http://wraf.org/