H2 is an SQL database engine written in Java that implements the JDBC API. Embedded, server, and clustering modes are available. A browser based console application is included. The database has strong security features. Disk based and in-memory databases and tables are supported.

Changes:
This release improves MySQL and PostgreSQL compatibility, improves the MVStore storage engine, and adds the new data type "geometry" for spatial data.

URL:
H2 Database Engine – Freecode

H2 Database Engine 1.3.173-0728_h2-database-engine_1.3.173.png