XUP (Extensible User Interface Protocol) is a SOAP-based protocol for delivering events and incremental UI updates. This project builds a web application development framework on top of XUP, consisting of a client, a server toolkit, and a template viewer.
Soya is an open-source implementation of the SSDL specification, built on top of the Windows Communictaion Foundation (WCF) (formerly Indigo). it provides a programming model and runtime environment for creating and enacting SSDL contracts.