Arcadedb

ArcadeDB is an open-source, multi-model database that supports graph, document, key-value, vector, full-text search, and time-series data models natively in a single engine. Designed for speed, flexibility, and scalability, it supports multiple query languages including SQL, OpenCypher, Gremlin, GraphQL, MongoDB, and Java API, making it ideal for developers and organizations needing high-performance, versatile data storage and querying without vendor lock-in. It is fully ACID compliant, achieves high throughput, and operates under a true open-source model with all features available for free.