Datomic is a database of flexible, time-based facts, supporting queries and joins, with elastic scalability, and ACID transactions.
Cost / License
- Freemium
- Proprietary
Platforms
- Mac
- Windows
- Linux
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, MongoDB and MariaDB.
Datomic is a database of flexible, time-based facts, supporting queries and joins, with elastic scalability, and ACID transactions.
Skytable is a free and open-source realtime NoSQL database that aims to provide flexible data modelling at scale.

The Starcounter database is built with the real-time systems of today in mind. Real-time systems supporting thousands or millions of simultaneous users. Systems like online stores, location-based services or banking applications.
NuoDB is a distributed database that can be deployed in any datacenter, in any cloud, anywhere, without the compromises inherent in other New SQL solutions.
?? lowdb is a small local JSON database powered by Lodash (supports Node, Electron and the browser)
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.
Mimer SQL is an SQL-based relational database management system from the Swedish company Mimer Information Technology AB (formerly: Upright Database Technology AB), which has been developed and produced since the 1970s.
Pivotal GemFire® is a real-time distributed data store that solves the hard problems of distributed systems for you. It provides a familiar Java interface for interacting with data of arbitrary complexity and shape, and accommodates ever-growing data sets and users with...
Ingres is the leading business open source database. Discover the New Economics of IT. Learn how to lower your TCO over a three-year period.
SAP HANA is a completely re-imagined platform for real-time business.
It transforms business by streamlining transactions, analytics, planning, predictive, sentiment data processing on a single in-memory database so business can operate in real-time.
TimesTen is a memory-optimized, relational database management system with persistence and recoverability. Originally designed and implemented at Hewlett-Packard labs in Palo Alto, California, TimesTen was spun out into a separate startup in 1996 and acquired by Oracle...