Echo is a platform for building web-based applications that approach the capabilities of rich clients. The applications are developed using a component-oriented and event-driven API, eliminating the need to deal with the “page-based” nature of browsers. To the developer, Echo works just like a user interface toolkit.
Echo2 is the current stable version of the framework. The 2.1RC releases are recommended for production use. A 2.1.0 version will be released in the very near future.