RethinkDB is described as 'The open-source database for the realtime web' and is an app in the development category. There are more than 50 alternatives to RethinkDB for a variety of platforms, including Linux, Windows, Mac, Self-Hosted and Web-based apps. The best RethinkDB alternative is SQLite, which is both free and Open Source. Other great apps like RethinkDB are PostgreSQL, MySQL Community Edition, MariaDB and MongoDB.
Firebird is a relational database offering many ANSI SQL-92 features that runs on Linux, Windows, and a variety of Unix platforms. Firebird offers excellent concurrency, high performance, and powerful language support for stored procedures and triggers.
ArangoDB database is an open-source NoSQL solution with a flexible data model for documents, graphs, and key-values.
FerretDB (formerly MangoDB) is an open-source proxy, which converts MongoDB wire protocol queries to SQL, and uses PostgreSQL as a database engine.
Azure Cosmos DB is a NoSQL document database service designed from the ground up to natively support JSON and JavaScript directly inside the database engine. It’s the right solution for web and mobile applications when predictable throughput, low latency, and flexible query are...
Cockroach is a distributed key/value datastore which supports ACID transactional semantics and versioned values as first-class features. The primary design goal is global consistency and survivability, hence the name.
YDB is an open source Distributed SQL Database that combines high availability and scalability with strong consistency and ACID transactions.
Couchbase is the NoSQL database market share leader, with production deployments at AOL, Deutsche Post, NTT Docomo, Salesforce.com, Turner Broadcasting Systems, Zynga and hundreds of other organizations worldwide.
SnapJSON is a lightweight, open-source ORM for Node.js that uses simple JSON files as a datastore.
Firestore is a NoSQL document database built for automatic scaling, high performance, and ease of application development. While the Firestore interface has many of the same features as traditional databases, as a NoSQL database it differs from them in the way it describes...
Bigtable is a fully managed wide-column and key-value NoSQL database service for large analytical and operational workloads as part of the Google Cloud Platform portfolio.
HyperDex is the next generation key-value store. It provides a rich API, strong consistency, fault-tolerance, and transactions.
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