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| [OpenLink Virtuoso RDF Views] | C | Virtuoso Meta Schema Language / R2RML | Free | 15.08.2018 | Mapping to external database only available in commercial version
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| [R2RML Parser] | Java | R2RML | Free | 11.02.2016 |
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| [Ontop] | Java | R2RML | Free| 06.03.2018 | Exist as a Protégé plugin |
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| [rdb2rdf] | Python | Direct mapping | Free | 24.11.2014 |
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| [RDF4J] aka Sesame + [R2RML API] | Java | R2RML | Free | 11.08.2018 |
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| [rdb2rdf] | Python | Direct mapping | Free | 24.11.2014 |
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| [R2D2] | PHP | D2RQ mapping language | Free | 01.10.2006 |
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* RDF triplestore and SPARQL endpoint:
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