Echo2 is the next-generation of the Echo Web Framework, a platform for developing web-based applications that approach the capabilities of rich clients. The 2.0 version holds true to the core concepts of Echo while providing dramatic performance, capability, and user-experience enhancements made possible by its new Ajax-based rendering engine.
Echo2 removes the developer from having to think in terms of "page-based" applications and enables him/her to develop applications using the conventional object-oriented and event-driven paradigm for user interface development. Knowledge of HTML, HTTP, and JavaScript is not required. Applications may be hosted using any Java servlet container. Echo2, like its predecessor, is open-source software distributed under the terms of the Mozilla Public License (or, if preferred, the GNU LGPL License).
Module Divisions
The Echo2 framework is divided into three distinct modules: the Application Framework, the Web Rendering Engine, and the Web Application Container. Coupling between the modules are kept to a minimum. The only dependency relationship amongst the modules is that the Web Application Container is dependent upon both the Application Framework and Web Rendering Engine modules. This dependency is NOT reciprocated.
Echo2 Home Page
http://www.nextapp.com/platform/echo2/echo/
Download Echo2
http://www.nextapp.com/platform/echo2/echo/download/
Echo2 Documentation
http://www.nextapp.com/platform/echo2/echo/doc/