SiteMesh was built upon the Java Servlet 2.3 API. It is a web-page layout system and web-application integration system to aid in creating large sites consisting of many pages for which a consistent look/feel, navigation, and layout scheme is required. It intercepts requests to any static or dynamically generated HTML page requested through the web-server, parses the page, obtains properties, and data from the content, and generates an appropriate final page with modifications to the original. It is ideally suited for Java based sites (particularly JSP) but can be dropped into any existing site that uses a Servlet engine including static, CGI, PHP, and ColdFusion generated pages.
Tapestry is a rich, component-based object model for developing dynamic, robust, highly interactive Web applications. Applications are constructed in terms of Java objects, methods and properties, instead of URLs and query parameters. It builds and interprets all URLs, dispatching directly to application-specific "listener" methods. It includes complete source code, documentation, tutorials and a complete example J2EE application.
Webtester is an application which is intended to be used in the testing and validation of Web-based applications. By reading an XML configuration file, the application is able to call URLs and use regular expressions to examine the results. Features include support for SSL, cookies, and variable assignment/substitution when sending and examining data.