Very fast SPARQL Engine, which can handle very large knowledge graphs like the complete Wikidata, offers context-sensitive autocompletion for SPARQL queries, and allows combination with text search. It's faster than engines like Blazegraph or Virtuoso, especially for queries involving large result sets.
Apache License 2.0
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Missing group by in this aggregated query does not produce an error as expected #1486
https://qlever.cs.uni-freiburg.de/wikidata/f6DCiu the same query gives Bad Aggregate error on WDQS