Submission + - UIDL: User Interface Description Language (uidl.net)
Dominic Cioccarelli writes: "UIDL aims to create a scriptable, JavaScript based language for expressing complex user interfaces. The main features of a UIDL page are the ability to create complex user interfaces (using Swing based widgets) and to communicate asynchronously with server based objects (using the JSON-RPC protocol). While this may sound similar to AJAX, the implementation is much cleaner thanks to the ability to natively instantiate complex UI components within the browser and the ability to transparently present server based objects via their JavaScript proxies."