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.
MX Query Builder allows table relation management, automating SQL query generation in a visual interface. It manages tables, relations, and conditions for queries in your Web browser, and integrates the resulted SQL directly in Dreamweaver, allowing you to use the server behaviors with it.