HSQLDB is a .

It has a JDBC driver and supports a rich subset of SQL-92, SQL-99 and SQL:2003 standards. It offers a small (less than 100k in one version), fast database engine which offers both in-memory and disk-based tables. Embedded and server modes are available.

Additionally, it includes tools such as a minimal web server, in-memory query and management tools (can be run as applets) and a number of demonstration examples. HSQLDB is currently being used as a database and persistence engine in many open source software projects, such as OpenOffice.org and the Standalone Roller Demo [http://rollerweblogger.org/page/roller/20040707#try_roller_it_s_easy], and even in commercial projects and products.

In its current version it is extremely stable and reliable. It is best known for its small size, ability to execute completely in memory and its speed. It can also run on Free Runtimes such as Kaffe.

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