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NextApp . Echo: "Echo
Echo is a framework for developing object-oriented, event-driven Web applications. Echo 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. Echo is open-source software distributed under the terms of the Mozilla Public License or the GNU LGPL License."
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