A pleasing aspect of the site is the inclusion of user ratings and reviews of the software. This kind of honesty makes choosing downloads easier. Alas, few reviews exist for many products, so you rarely have the benefit of multiple perceptions. Java Peering into the Java zone, you will find a wealth of tools. Sign up for the course, then download the courseware.
More advanced courses are also available.
Elsewhere were posted excerpts from upcoming books on Java and interviews with famous Java developers. Some tools in this zone are especially interesting. For example, the complete code and documentation for IBM's Jikes project is available on the site. Jikes is IBM's open-source compiler for Java. Numerous compiler-oriented tools are included in the package.