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State-of-the-art linked data technologies

List of characteristics we look for, when testing linked data tools:
  1. Data source. Which types of data sources are used as input to linked data production (e.g. RDBMS, RDF, XML, etc).
  2. SPARQL endpoint. Whether a SPARQL endpoint is provided.
  3. Web server. Web server used.
  4. Materialized/Virtual RDF. Whether RDF triples are created and stored before-hand, or created on the fly.
  5. RDF store. What kind of RDF storage is provided (e.g., RDBMS, native store).
  6. Rich/Flexible Mapping Support. Whether declarative mapping facilities are provided to describe mappings between data source schemas (relational, XML, etc) and the RDF schema used for linked data production.
  7. Scalability. Info about data size properly handled (demos, working examples, etc).
  8. Prog. Language/API. Programming languages used to develop applications.
  9. SPARQL Visual interface. Whether there are visual, intuitive ways to pose SPARQL queries.
  10. LOD Visualization. Whether LOD exploration facilities are used.
  11. Co-reference. Provision of co-reference tools to semi-automatically detect links between same entities having different URIs.

1. D2R server

GPL

1. Data source 2. SPARQL endpoint 3. Web server 4. Mat./Virt. RDF 5. RDF store 6. Mappings 7. Scalability 8. Prog. Lang./API 9. SPARQL Vis. interface 10. LOD Visual. 11. Co-refer.
Relational joseki jetty virtual RDBMS yes here Java No No Yes

2. Virtuoso

GPL

1. Data source 2. SPARQL endpoint 3. Web server 4. Mat./Virt. RDF 5. RDF store 6. Mappings 7. Scalability 8. Prog. Lang./API 9. SPARQL Vis. interface 10. LOD Visual. 11. Co-refer.
Relational, RDF, XML ?? ?? virtual RDBMS yes here Many No No No

3. Triplify

GPL

1. Data source 2. SPARQL endpoint 3. Web server 4. Mat./Virt. RDF 5. RDF store 6. Mappings 7. Scalability 8. Prog. Lang./API 9. SPARQL Vis. interface 10. LOD Visual. 11. Co-refer.
Relational ?? ?? virtual RDBMS yes <100MB PHP No No No

4. TopQuadrant

commercial

1. Data source 2. SPARQL endpoint 3. Web server 4. Mat./Virt. RDF 5. RDF store 6. Mappings 7. Scalability 8. Prog. Lang./API 9. SPARQL Vis. interface 10. LOD Visual. 11. Co-refer.
Relational, RDF ?? ?? virtual/materialized RDBMS, Jena SDB/TDB, AllegroGraph, Oracle 11g and Sesame yes ?? ?? No No No

5. Others