SPARQL Endpoint

A SPARQL Endpoint is a SPARQL protocol service which enables users to Query a Knowledge Base (like DBpedia) with the help of the SPARQL Language. Simply, a SPARQL Endpoint is an Interface towards a Knowledge Base.

Some popular SPARQL (1.0) Endpoints are

OpenLink Virtuoso. This instance has the most computing resources behind it and the least restrictive "fair use" rules.

A SPARQL 1.1 Endpoints can be found at Ontotext

There exists an overview of all active SPARQL Endpoints [http://www.w3.org/wiki/SparqlEndpoints] as well as uptime service that monitors the availability off all SPARQL Endpoints that are cataloged in CKAN.