* RAP lets you develop modern web UIs with a real widget toolkit with SWT API, which includes powerful features like drag & drop, loading data on demand, inline editing, and drawing. * RAP runs in all relevant web browsers, without any add-ons required. Many advanced features like gradients are rendered even in browsers without CSS3 support. * RAP uses standard servlet technology and runs on any JEE servlet container. It integrates well with OSGi, but can also be used stand-alone. * RAP applications are written in Java, and you have the full power of Eclipse's development tools at hand. * With RAP, you can re-use your code for different target platforms. Even code that has been written for Eclipse RCP can run in a web browser.

* The GWT SDK provides a set of core Java APIs and Widgets. These allow you to write AJAX applications in Java and then compile the source to highly optimized JavaScript that runs across all browsers, including mobile browsers for Android and the iPhone. * Constructing AJAX applications in this manner is more productive thanks to a higher level of abstraction on top of common concepts like DOM manipulation and XHR communication. * You can debug AJAX applications in your favorite IDE just like you would a desktop application, and in your favorite browser just like you would if you were coding JavaScript. The GWT developer plugin spans the gap between Java bytecode in the debugger and the browser’s JavaScript. * GWT contains two powerful tools for creating optimized web applications. The GWT compiler performs comprehensive optimizations across your codebase — in-lining methods, removing dead code, optimizing strings, and more. By setting split-points in the code, it can also segment your download into multiple JavaScript fragments, splitting up large applications for faster startup time. * When you’re ready to deploy, GWT compiles your Java source code into optimized, stand-alone JavaScript files that automatically run on all major browsers, as well as mobile browsers for Android and the iPhone.