Arcadedb

ArcadeDB is an open-source, multi-model database that supports graphs, documents, key-value pairs, vector search, full-text BM25 search, and time-series data—all in a single, high-performance engine. Designed for developers who require flexible data modeling, high-speed querying, and broad compatibility, ArcadeDB natively supports popular query languages such as SQL, OpenCypher, Gremlin, GraphQL, and the MongoDB protocol. With full ACID compliance, advanced OLAP and OLTP graph analytics, and an Apache 2.0 license, it's suited for mission-critical workloads from embedded Java apps to distributed, cloud-scale environments.