H2 is a Java SQL database. This database can be used in embedded mode, or in server mode.

H2 Features:
1. Very fast
2. Open Source
3. Java
4. Embedded, Server, and Cluster
5. Disk and In Memory
6. Strong security features

To use it in embedded mode, you need to:
1. Add the h2*.jar to the classpath (H2 does not have any dependencies)
2. Use the JDBC driver class: org.h2.Driver
3. The database URL jdbc:h2:~/test opens the database test in your user home directory
4. A new database is automatically created

Requirements:
* Java

The license of this software is Free, you can free download and free use this database management software.