db4o is an object database for Java and all .NET environments. Its features include ACID transactions, automatic class schema recognition, query-by-example, a S.O.D.A. object querying API, native queries, LINQ support on .NET, callback methods, memory files, cascade-on-delete, multi-threaded access, and Java Webstart and servlet support.
MetaBoss is an integrated suite of tools for the design, development, and management of enterprise software systems through modelling. It utilises OMG's Model Driven Architecture concepts and is primarily oriented at enterprises using Java based tools and technologies. It encourages serious upfront analysis and design and aims to crystallise the value of it by automating a number of activities in the Software Development Life Cycle.
JayBird is JCA/JDBC driver suite for connecting to Firebird database servers. It was based on Borland's InterClient JDBC driver and uses the new JCA standard, which specifies an architecture in which an application server can cooperate with a driver so that the application server manages transactions, security, and resource pooling, and the driver supplies only the connection functionality. It also supports JDBC.
Druidedb is a simple XML file database API in Java to manage an XML database file system without database complexity (no server or client, and stores only strings). This API creates both the access DAO sources files and the DB filesystem. It can handle auto-increments and primary keys.
Spring is a lightweight Java/J2EE application framework based on code published in "Expert One-on-One J2EE Design and Development" by Rod Johnson. It includes powerful JavaBeans-based configuration management applying Inversion-of-Control principles, a generic abstraction layer for transaction management allowing for pluggable transaction managers, a JDBC abstraction layer, integration with Hibernate, JDO, Apache OJB, and iBATIS SQL Maps, AOP functionality, and a flexible MVC Web application framework with multiple view technologies. There is also a .NET port available.