Blazegraph is an open source triplestore and graph database,[3][4][5][6] written in Java.

It has been abandoned since 2020 and is known to be used in production by WMDE for the Wikidata SPARQL endpoint.

Amazon acquired the Blazegraph developers and the Blazegraph open source development was essentially stopped in April 2018.

Since release of version 1.5 (12 February 2015), it is named Blazegraph.

[8][9] It was alleged[21] that Amazon Neptune is based on Blazegraph, as evidenced by: