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4store

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CQLite

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EchoDB

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EliasDB

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Fireproof

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JameSQL

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Jena

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Kognitio

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LEAP

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Memgraph

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Mimir

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ObjectDB

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OpenQM

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Polyhedra

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RaptorDB

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RDFox

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Reality

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Superbase

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Tablespace

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ThinkSQL

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ts-sql

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Xapian

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XTDB

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