Hydra is an open source, column-oriented Postgres. Query billions of rows instantly, no code changes.
Cost / License
- Freemium
- Open Source (Apache-2.0)
Platforms
- Software as a Service (SaaS)
- Self-Hosted
- Docker



PostgreSQL is described as 'Powerful, open source object-relational database system with over 35 years of active development that has earned it a strong reputation for reliability, feature robustness, and performance' and is a very popular relational database in the development category. There are more than 50 alternatives to PostgreSQL for a variety of platforms, including Windows, Linux, Mac, Self-Hosted and Web-based apps. The best PostgreSQL alternative is SQLite, which is both free and Open Source. Other great apps like PostgreSQL are MySQL Community Edition, MariaDB, MongoDB and Microsoft SQL Server.
Hydra is an open source, column-oriented Postgres. Query billions of rows instantly, no code changes.



An embedded database built on object storage. Unlike traditional LSM-tree storage engines, SlateDB writes data to object storage to provide bottomless storage capacity, high durability, and easy replication.


A Postgres Database as a Service platform so you can focus on writing your app, not on becoming a database administrator.


Marple DB is a high-performance database designed for processing and standardising time series data from measurement files.




Amazon DynamoDB is a fully managed NoSQL database service offered by Amazon.com as part of the Amazon Web Services portfolio. It was announced by Amazon CTO Werner Vogels on January 18, 2012.OverviewDynamoDB differs from other Amazon services by allowing developers to purchase a...

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.
CUBRID is a comprehensive GPL/BSD open source relational database management system highly optimized for Web Applications. CUBRID is being developed in C/C++. Includes native HA, online hot backup, and other features. JDBC, PHP, ODBC/.NET, Ruby & Python APIs.
FerretDB (formerly MangoDB) is an open-source proxy, which converts MongoDB wire protocol queries to SQL, and uses PostgreSQL as a database engine.




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.
H2 is a relational database management system written in Java. It can be embedded in Java applications or run in the client-server mode. The disk footprint (size of the jar file) is about 1 MB.