entities similar to DARQ - Federated Queries with SPARQL (http://darq.sourceforge.net/)
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Mulgara Semantic Store (http://www.mulgara.org/)2
Sesame (http://www.openrdf.org/)2
d2r (http://www4.wiwiss.fu-berlin.de/bizer/d2r-server/)2
Graphity (https://github.com/Graphity)2
Jena (http://jena.sourceforge.net/)2
#344768 sparql: cast / xsd support1
Nuxeo - Digital Asset Management (http://www.nuxeo.com/en/products/dam)1
Cultural Data in Italy (http://dati.culturaitalia.it/)1
Stanbol - Apache Stanbol is a modular software stack and reusable set of components for semantic content management. (http://wiki.apache.org/incubator/StanbolProposal)1
Claros Data (http://data.clarosnet.org/)1
Geonames in CubicWeb !1
SPARQL 1.1 Federation Extensions (http://www.w3.org/TR/2010/WD-sparql11-federated-query-20100601/)1
rqlquery1
StrixDB (http://www.strixdb.com/)1
uberblic (http://uberblic.org/)1
BigQuery (https://developers.google.com/bigquery/)1
#344859 default NS in sparql queries1
#344766 sparql: FILTER support1
Sparkles everywhere, CubicWeb gets fizzy1
sparallax (http://sparallax.deri.ie/)1
Spyder (http://www.revelytix.com/content/spyder)1
#344764 sparql: OPTIONAL support1
OpenAnzo (http://www.openanzo.org/)1
sgvizler (http://code.google.com/p/sgvizler/)1
Humfrey - ReSTful LD interface to SPARQL endpoint. (https://github.com/ox-it/humfrey)1
4store (http://4store.org/)1
Virtuoso (http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VOSIntro)1
dbtune (http://dbtune.org/)1
sdshare (http://sdshare.org/)1