A component model for producing interactive and reusable J2EE web systems using object oriented methodologies. It is built on a flexible pipeline architecture and is easy to integrate with other technologies. [Open source, LGPL]

Capture, analyze, and publicize health, performance, and monitoring statistics for Java applications. [Open source, LGPL]

A framework for developing reliable database applications in a technology independent and predominantly editorial way. User interfaces may be easily exchanged from Swing to HTML and vice versa. Also test JavaServerPage sample application for it. [Open...

Offers a set of web controls (custom JSP tags, servlets, filters) for J2EE applications.

Form a Java Presentation Framework based on Java Servlets, JSP and Struts. The Presentation Framework contains the most common control elements like lists, trees, tabfolders, menus and forms, which are required for the development of J2EE applications...

A Java framework for web applications accessing one or several databases to generate dynamic content. It can be used as part of intranet applications automating complex business processes or work-flows. [Open source, GPL]

A framework to create web applications with Java. It's based on the MVC architecture (model-view-controller). [Open source, LGPL]

Article at the Financial Technology Network about the release of the source code of OpenAdaptor as Open Source.

Library of extensible Java Servlet components for providing services to web-based applications. [Open Source, BSD-like]

An application server component framework, includes logging, thread pooling, and scheduling. [Apache]