YAWLS - Yet Another Web-client Language for Scripting

Una especie de Javascript de Sun, incluye un lenguaje declarativo para interfaces, tipo tipo XUL/XAML/XIML

Sun developing open source JavaFX Script compiler

Sun developing open source JavaFX Script compiler By Ryan Paul | Published: July 20, 2007 - 07:41PM CT In May, Sun announced the availability of JavaFX Script, a highly expressive language for developing portable rich interactive media applications. JavaFX script has some nice syntactic features like Pythonic list comprehensions and support for first-class functions, but the main selling point is a declarative syntax for describing user interfaces and vector art.