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MySQL, the most popular Open Source SQL database management system, is developed, distributed, and supported by Oracle Corporation.
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]
MariaDB is a community developed branch of MySQL. It's a branch of MySQL (ie, we are keeping our code in sync with MySQL) and contains in addition the Maria storage engine, updated version of other storage engines and extensions.
Percona Server with XtraDB is a backwards-compatible replacement for MySQL that is much faster and more scalable, easier to monitor and tune, and has features to make operational tasks easier.
VoltDB - Fast, scalable, open-source OLTP SQL database with ACID is an alternative to NoSQL key-value stores and database sharding.