Wikipedia
ThinWire
ThinWire is an open source, Java-based web application framework that uses Ajax techniques to give Web Applications the look and feel of traditional GUI applications. The project is open source software licensed under the GNU Lesser General Public License.
ThinWire implements an event-driven programming model, similar to that used in many desktop applications, to an Ajax framework. The source code of a ThinWire based application will more closely resemble that of a traditional desktop GUI application than it will a web application. ThinWire handles web rendering and communication between web browser and web server.