Oracle TopLink and ADF

The free Oracle TopLink and Application Development Framework (ADF) provides a complete J2EE application infrastructure for Java developers to build Java object-to-relational persistence architectures. It's part of Oracle Application Server, but can be used independently with other J2EE-compliant application servers.

Oracle Developer Suite

If you're an Oracle database application developer, try the free Oracle Developer Suite of products (including JDeveloper, Oracle Designer, Oracle Forms Developer, Oracle Software Configuration Manager, Oracle Reports Developer, Oracle Discoverer, Oracle Warehouse Builder, and Oracle Business Intelligence Beans).

Oracle JDeveloper 10g

Are you a Java application developer in need of an industry-leading tool to work with databases? Try Oracle's free Oracle JDeveloper 10g. It works with Oracle and non-Oracle environments, and supports all major J2EE application servers and databases.