name of a KG,description,URL for KG frontend,URLs for SPARQL endpoint,URL for (REST) API,URL for dump files,NFDI consortium,"KG maintainer (institution, person)",contact person,software,ontology,use cases
Wikidata,A multi-domain KG having many entities from the domains of interest of NFDI. Coordination of NFDI-related activities is at https://www.wikidata.org/wiki/Wikidata:WikiProject_NFDI.,https://www.wikidata.org,https://query.wikidata.org,https://doc.wikimedia.org/Wikibase/master/js/rest-api,https://www.wikidata.org/wiki/Wikidata:Database_download,,Wikimedia Germany,,Wikibase,https://www.mediawiki.org/wiki/Wikibase/DataModel,https://www.wikidata.org/wiki/Wikidata:WikiProject_NFDI
MaRDI portal,,https://portal.mardi4nfdi.de,https://query.portal.mardi4nfdi.de,https://portal.mardi4nfdi.de/w/api.php,,MaRDI,FIZ Karlsruhe,Moritz Schubotz,Wikibase,https://www.mediawiki.org/wiki/Wikibase/DataModel,"Data integration, formula search (https://portal.mardi4nfdi.de/wiki/Special:MathSearch), Scholia-app (https://scholia.portal.mardi4nfdi.de)"
Culture Knowledge Graph,"A connector for all research data produced within the NFDI4Culture research landscape, improving the findability, accessibility, interoperability and reusability of cultural heritage data within the 4Culture Domain.",https://nfdi4culture.de/resources/knowledge-graph,https://nfdi4culture.de/sparql,,,NFDI4Culture,FIZ Karlsruhe,Harald Sack,TYPO3 + TYPO3 LOD Extension + oxigraph,https://github.com/ISE-FIZKarlsruhe/nfdi4culture-ontology ; https://nfdi4culture.de/ontology.html,"Serves as a central access point, integrating data provided by NFDI4Culture itself and by the addressed research communities as fully fledged Linked Open Data or as structured data based on the Culture Graph Interchange Format (CGIF)"
Linked Stage Graph,A Knowledge Graph developed during the Coding da Vinci Süd 2019 hackathon using a dataset by the National Archive of Baden-Wuerttemberg.,https://slod.fiz-karlsruhe.de/about,https://slod.fiz-karlsruhe.de/sparql,,,NFDI4Culture,FIZ Karlsruhe,Tabea Tietz,Virtuoso + Vikus Viewer,,"Connecting historical theater photographs to on-stage events like theater plays, operas and ballet performances as well as off-stage moments and theater buildings."
Semantic Kompakkt,"A toolchain for the semantic annotation of 2D, 3D and AV media representing digitised cultural heritage obects",https://wikibase.semantic-kompakkt.de,https://query.semantic-kompakkt.de,https://wikibase.semantic-kompakkt.de/w/api.php,,NFDI4Culture,TIB,Lozana Rossenova,Wikibase + Kompakkt,https://gitlab.com/nfdi4culture/ta1-data-enrichment/wikibase-model/,Combining a media viewer with semantic annotation and desription capabilities for digitised cultural artefacts (including 3D). 
Open Research Knowledge Graph,,https://orkg.org,https://orkg.org/triplestore; https://orkg.org/sparql,http://tibhannover.gitlab.io/orkg/orkg-backend/api-doc,,NFDI4DataScience,TIB,Markus Stocker,,,
Aktienführer Knowledge Graph,,https://akf.kgi.uni-mannheim.de,https://query.akf.kgi.uni-mannheim.de,https://akf.kgi.uni-mannheim.de/w/api.php,,BERD@NFDI,UB Mannheim,Renat Shigapov,Wikibase,https://www.mediawiki.org/wiki/Wikibase/DataModel,Matching company data using the reconciliation API (https://rec.akf.kgi.uni-mannheim.de)
MaschinenBauIndustrie KG,,https://mbi.kgi.uni-mannheim.de , https://query.mbi.kgi.uni-mannheim.de,https://mbi.kgi.uni-mannheim.de/w/api.php,,BERD@NFDI,UB Mannheim,Renat Shigapov,Wikibase,https://www.mediawiki.org/wiki/Wikibase/DataModel,Matching company data using the reconciliation API (https://rec.mbi.kgi.uni-mannheim.de)
FactGRID,,https://database.factgrid.de,https://database.factgrid.de/query,https://database.factgrid.de/w/api.php,,NFDI4Memory,Gotha Research Centre at the University of Erfurt,Olaf Simons,Wikibase,https://www.mediawiki.org/wiki/Wikibase/DataModel,Structured data for historians
The official portal for European data,European public sector datasets,https://data.europa.eu,https://data.europa.eu/sparql,,,,,,Piveau,,
Das Datenportal für Deutschland,,https://www.govdata.de,https://www.govdata.de/web/guest/sparql-assistent,,,,,,CKAN + Apache Jena Fuseki,,
TweetsKB,a public RDF corpus of anonymized data for a large collection of annotated tweets,https://data.gesis.org/tweetskb,https://data.gesis.org/tweetskb/sparql,,https://data.gesis.org/tweetskb/#dataset,NFDI4DataScience,GESIS,Stefan Dietze,Virtuoso,https://data.gesis.org/tweetskb/#Data-model,
TweetsCov19,a semantically annotated corpus of Tweets about the COVID-19 pandemic,https://data.gesis.org/tweetscov19/,https://data.gesis.org/tweetscov19/sparql,,https://data.gesis.org/tweetscov19/#Dataset,NFDI4DataScience,GESIS,Stefan Dietze,Virtuoso,https://data.gesis.org/tweetscov19/#Data-model,
Gemeinsame Normdatei (GND),Integrated Authority File,https://www.dnb.de/EN/Professionell/Metadatendienste/Datenbezug/LDS/lds_node.html,work in progress,,https://data.dnb.de/opendata,Text+,DNB,,,https://d-nb.info/standards/elementset/gnd,
LinkedOpenData-Service des B3Kat,"descriptions of 28 million titles from 200 academic libraries in Bavaria, Berlin and Brandenburg",http://lod.b3kat.de/doc/de/willkommen-beim-linkedopendata-service-des-b3kat-lodb3katde,https://lod.b3kat.de/doc/sparql-endpoint,,https://lod.b3kat.de/doc/download,,Bayerische Staatsbibliothek,,,,
Data Set Knowledge Graph (DSKG),a RDF data set about data sets which are linked to publications that mention the data sets,http://dskg.org,not available anymore,,http://dskg.org/rdf-dumps,,KIT,Michael Färber,,,
ClaimsKG,a registry of claims,https://data.gesis.org/claimskg,https://data.gesis.org/claimskg/sparql,,https://doi.org/10.7802/2469,NFDI4DataScience,GESIS,Stefan Dietze,Virtuoso,,
Question Features Sample,a Knowledge Graph of Annotated Survey Questions,https://data.gesis.org/questionfeaturessample,https://data.gesis.org/questionfeaturessample/sparql,,,NFDI4DataScience,GESIS,Felix Bensmann,Virtuoso,,
SoMeSci,Software Mentions in Science,https://data.gesis.org/somesci,https://data.gesis.org/somesci/sparql,,https://zenodo.org/record/4701764,NFDI4DataScience,GESIS,Felix Bensmann,Virtuoso,,
SoftwareKG,"2 KGs containing scholarly articles with extracted software mentiones, one KG wit articles from the social science domains, the other one with articles from PubMed.",https://data.gesis.org/softwarekg/,https://data.gesis.org/softwarekg/sparql,,https://doi.org/10.5281/zenodo.5553738 and https://doi.org/10.5281/zenodo.3571350,NFDI4DataScience,GESIS,Felix Bensmann,Virtuoso,https://data.gesis.org/softwarekg/softwarekg-pubmed/#Data-model,
InteractOA (using Wikidata),Very specific usage of Wikidata to demonstrate referencing to sources (started 2018 already), https://interactoa.toolforge.org/,,,,NFDI4Microbiota,ZB MED,"Muhammad Elhossary, Konrad Förstner",Wikidata,,
NFDI4Earth Knowledge Graph,As of may 17: pretty much work in progress. We have got started with setting up a triple store and are currently populating it with instances,tbd,https://nfdi4earth-knowledgehub.geo.tu-dresden.de/fuseki/dataset.html,n/a,tbd,NFDI4Earth,TUD,"Jonas Grieb, Auriol Degbelo",Custom middleware solution + Apache Jena Fuseki,,ressource discovery in the earth system sciences
SciMesh,,https://scimesh.org/about/,,,,NFDI4Ing,"FZ Jülich, KIT",,,,
Unified Helmholtz Information and Data Exchange,Currently being set up,https://search.unhide.helmholtz-metadaten.de/,,,,,FZ Jülich,,,,
dblp computer science bibliography,,,https://sparql.dblp.org ,,,,,,,,
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OpenAIRE Research Graph,"is an open resource that aggregates a collection of research data properties (metadata, links) available within the OpenAIRE Open Science infrastructure for funders, organizations, researchers, research communities and publishers to interlink information by using a semantic graph database approach. ",https://explore.openaire.eu ; https://monitor.openaire.eu ; https://osobservatory.openaire.eu,,https://api.openaire.eu,https://doi.org/10.5281/zenodo.3516917,,,Paolo Manghi,,https://graph.openaire.eu/docs/,