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.
HSQLDB (Hyper Structured Query Language Database) is a relational database management system written in Java. It has a JDBC driver and supports a large subset of SQL-92 and SQL:2008 standards. It offers a fast, small (around 1300 kilobytes in version 2.

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.
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.



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


DB2 offers industry leading performance, scale, and reliability on your choice of platform from Linux to z/OS. DB2 supports storing XML and relational data and offers SQL PL and PL/SQL procedural languages.
The FoundationDB Key-Value Store, Rock solid. Versatile. Easy to operate.
The Key-Value Store is a database that combines scalability, fault-tolerance, and high performance with incredibly powerful multi-key ACID transactions.
Clustrix is the leading scale-out SQL database engineered for the cloud. With Clustrix, you can scale transaction throughput, run real-time analytics, and simplify operations.
Cost / License
- Freemium
- Proprietary
Application type
Platforms
- Mac
- Windows
- Linux
- Raspberry Pi

QueryPie is a centralized platform to manage scattered data sources and security policies all in one place, 1) without changing the existing data environment, 2) integrating with the identity provider system, and 3) enabling attribute-based access control.
Cost / License
- Paid
- Proprietary
Application type
Platforms
- Self-Hosted
- Software as a Service (SaaS)
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.
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.
Cost / License
- Paid
- Proprietary
Application type
Platforms
- Mac
- Windows
- Linux
- Windows Mobile
- Android
- Symbian S60
A complete cloud-first data platform that includes a multi-model transactional data management engine, an application development platform, and interoperability engine, and an open analytics platform.
Cost / License
- Paid
- Proprietary
Application type
Platforms
- Mac
- Windows
- Linux
- Software as a Service (SaaS)
Tibero is an Oracle compatible SQL RDBMS that is secure, scales easily and conforms to today’s cost optimized cloud architectures.
FrontBase was created to fill the need for a robust and scalable relational database server that was Internet enabled, had no downtime, and required zero administration. FrontBases speed, wide range of features, and flexible structure can give you the competitive edge.
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...
Cost / License
- Paid
- Proprietary
Application types
Platforms
- Windows
- Linux
A powerful, reliable, and durable open-source SQL-compliant database, PostgreSQL is the datastore of choice for serious applications. Now it is available in seconds with a single click. Never worry about servers. Never worry about config files. Never worry about patches.
DBLX is a multi-user, client-server relational database written in Java. DBLX is compatible with any operating system which supports Java such as Windows, Mac, Linux, UNIX, Android, Symbian and Meego.
The design goals of DBLX are to produce a very small, very fast database which.
Cost / License
- Free
- Proprietary
Application type
Platforms
- Mac
- Windows
- Linux
- Android
- Java Mobile
- Android Tablet
Enea Polyhedra is a family of the two main products Polyhedra IMDB and Polyhedra FlashLite. Both are relational database systems, sharing the same SQL engine, the same client server architecture and protocols, and both support the hot-standby model for use in high-availability...
Actian PSQL combines a NoSQL transactional engine and a SQL relational engine to deliver a zero-DBA database platform for business applications.
Advantage Database Server is a full-featured, easily embedded, client-server, relational database management system that provides you with Indexed Sequential Access Method (ISAM) table-based and SQL-based data access.
Postgres is the endgame database. Gel supercharges it with a modern data model, graph queries, Auth & AI solutions, and much more.
















































