ArcadeDB

ArcadeDB is a multi-model database that handles graph, document, key-value, search, time-series, vector, and geospatial data in one ACID-compliant engine. It stores structured and unstructured data without joins, linking records natively, and runs either embedded or as a server.

Queries can be written in SQL, Cypher, Gremlin, GraphQL, or MongoDB query language, and clients connect over HTTP/JSON or through Postgres, Redis, and MongoDB wire protocols. The engine adds 70+ built-in graph algorithms, parallel query execution, materialized views, hash indexes, full-text search, and geospatial functions.

Created by Luca Garulli, the founder of OrientDB, ArcadeDB is written in low-level Java for minimal garbage-collection pressure. It scales from a Raspberry Pi to cloud clusters, ships Docker and Kubernetes support, and is released under the Apache 2.0 license.