ORMLite
Object Relational Mapping Lite (ORM Lite) provides some simple, easy, and basic functionality for persisting Java objects to SQL databases while avoiding the complexity and overhead of more standard ORM packages.
ORMLite supports natively MySQL, Postgres, Microsoft SQL Server, H2, Derby, HSQLDB, and Sqlite and can be extended to additional ones relatively easily.
(追記) (追記ここまで)
License
BSD License