UI library that brings the simplicity of native UI development to web
Ooui (pronounced weee!) is a small cross-platform UI library for .NET that uses web technologies. It presents a classic object-oriented UI API that controls a dumb browser. With Ooui, you get the full power of your favorite .NET programming language plus the ability to interact with your app using any device. Make sure to add a reference to Ooui before you start running! With just code, a web server that serves the HTML and web socket logic necessary for an interactive button will start....
NWic is a .NET web development framework ported from a Java open-source project called jWic. NWic helps software developers building rich-client style web applications using the MVC design pattern. The UI is updated using the integrated AJAX features.
The emerge toolkit is a state-preserved web development framework. Build your whole application in one easy place. Uses O/R Mapping on the back-end, and Comet-style sockets on the front. http://emergetk.com