Open invitation for crowd-sourcing an up to date list of query service endpoints that underlie the massive LOD Cloud Knowledge Graph .
Here is our link to a Google Spreadsheet that contains a list of SPARQL Query Service endpoints - please feel free to contribute any endpoints not on the list .
The LOD Cloud is a live demonstration of the following capabilities offered by RDF-compliant Graph Database Management Systems (a DBMS sub-genre) with regards to:
 Ad-hoc queries – varying complexity from any combination of human or bots
 Performance, Scalability, and Availability
 Entity Relationship Graph Exploration – before and after query solution production
Existing HTTP, ODBC, JDBC, ADO. NET, and OLE DB compliant apps and services all have access to this massive Knowledge Graph
Richer knowledge can be derived by combining local data with master data from this Knowledge Graph