The Document-Graph database supports SQL and Native Queries, asynchronous commands, intents, and much more.
Cost / License
- Free
- Open Source (Apache-2.0)
Platforms
- Mac
- Windows
- Linux
- Java


Sites and apps similar to Firestore include MongoDB, which has a free version. Other options are CouchDB, Apache Cassandra, Triplit and ArangoDB. You can choose from more than 10 Relational Databases like Firestore for Windows, Linux, Mac, self-hosting and Android.
The Document-Graph database supports SQL and Native Queries, asynchronous commands, intents, and much more.


LiteDB is an open-source, MongoDB-like database that requires no configuration and is mobile-ready. It's a serverless database delivered in a single DLL under 450kb, fully written in .NET C# managed code and compatible with .NET 4.5 and NETStandard 2.0.



EJDB 2.0 — Embeddable JSON Database engine C library. Simple XPath like query language (JQL). Websockets / Android / iOS / React Native / Flutter / Java / Dart / Node.js bindings.

MarkLogic is the only Enterprise NoSQL database, bringing all the features you need into one unified system: a document-centric, schema-agnostic, structure-aware, clustered, transactional, secure, database server with built-in search and a full suite of application services.