Library that attempts to take the pain out of generating SQL queries within Java programs. LGPL

SqlBuilder (OpenHMS) 2.0.3 wraps the SQL syntax within very lightweight and easy to use Java objects that follow the "builder" paradigm (similar to StringBuilder). This changes many common SQL syntactical, runtime errors into Java compile-time errors.

Framework to develop JavaEE/J2EE applications rapidly and easily. LGPL

OpenXava 3.0.2 allows you to define applications only with POJOs, JPA, and Java 5 annotations. It is feature rich and flexible. It generates JSR-168 portlet applications (Liferay, WebSphere Portal, Jetspeed, etc.).

Java Graphing framework. LGPL

JGraph 5.12.0.0 is a free, mature, and robust Java Graphing framework that fully complies with Swing design principles. It contains all the graph visualization and interaction functionality you might expect in a graph library, including multiple views, layering, zoom, drag and drop, undo, automatic expanding and collapsing, routing, and layouts. You can create stunning workflow editors, call graphs, CAD tools, network diagrams, database visualization tools, and more. It can also be deployed on the server-side with a large range of image exporting functionality. It is fully documented and commercially supported.

Tool for Java developers. Freeware

Refactorit 2.6
A developer can take source code of any size and complexity and rework it into well-designed code by means of over 30 automated refactorings. In addition, it provides a comprehensive set of smart query functions, a graphical dependency analyzer, and over 100 quality metrics, audits, and corrective actions, that make it possible to analyze and track large volumes of code. It may be used as a stand-alone tool or installed as an add-in to Eclipse, NetBeans, and JBuilder.