Rwt is a toolkit for developing desktop-like web applications. Built intitially on top of ExtJs javascript library, it creates an environment where you can program your visual interface in views using javascript or ruby. If you use ruby views the details of dealing with ExtJs and other javascript libraries will be hidden from you. If you prefer to program directly in javascript you can do this and in this case you will have a kind of erb processing, so that it’s easy to fill your javascript code with values from the rails controllers.

The easiest way to use rwt is to install it as a plugin.