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MySQL, the most popular Open Source SQL database management system, is developed, distributed, and supported by Oracle Corporation.
PostgreSQL is a powerful, open source relational database system. It has more than 15 years of active development and a proven architecture that has earned it a strong reputation for reliability, data integrity, and correctness. It runs on all major operating systems, including Linux, UNIX (AIX ... [More]
hsqldb is a relational database engine written in Java with a JDBC driver that supports a subset of ANSI SQL:1999. It offers a small, fast database engine. Embedded and server modes are available. It includes tools such as a minimal Web server, in-memory query and management tools (which can be run ... [More]
Firebird is a relational database offering many ANSI/ISO SQL standard 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. It has been used in production ... [More]
Ingres Database is the open source database management system that can reduce IT costs and time to value while providing the strength and features expected from an enterprise class database. Ingres Database is a leader in supporting business critical applications and helping manage the most ... [More]
Neo4j is a graph database. It is an embedded, disk-based, fully transactional Java persistence engine that stores data structured in graphs rather than in tables. A graph (mathematical lingo for a network) is a flexible data structure that allows a more agile and rapid style of development.
Raven is an Open Source (with a commercial option) document database for the .NET/Windows platform. Raven offers a flexible data model design to fit the needs of real world systems. Raven stores schema-less JSON documents, allow you to define indexes using Linq queries and focus on low latency and high performance.
Java Desktop SQL Database Engine with JDBC 3.0 API. SmallSQL is small, fast, embeddable, SQL 99 conformance, platform independent and 100% pure Java
CloudB covers a gray area in the data storage segment, by providing a scalable, distributable and robust system. Many would define it as being in the stream of no-SQL movement, but it's actually data-model agnostic: this means it could also support an SQL model over a distributed network. ... [More]
SimpleDBM is an OpenSource Transactional Database Engine in Java. It has a very small footprint and can be embedded in the address space of an application. It provides a simple programming API, which can be learned very quickly. More recently work is being done to provide a network API for remote ... [More]