| Datahike | A Datalog engine supporting immutability and distribution. |
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| Datomic | Distributed database with an immutable data model and Datalog implementation. |
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| Formulog | Datalog with support for SMT queries and first-order functional programming. |
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| Gremlin | Graph traversal language and virtual machine developed by Apache TinkerPop. |
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| HiveQL | SQL-like query language for Hadoop developed by Apache Hive. |
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| jq | Lightweight and flexible command-line JSON processor. |
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| SQL | Domain-specific language for managing data in relational databases. |
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| XPath | Expression language for querying and transforming XML documents. |
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| XQuery | W3C language for querying and transforming XML data using XPath. |
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