IAML, the Internet Application Modelling Language, is an MDA-compliant modelling language for Rich Internet Applications, and has been the focus of PhD research at Massey University, New Zealand.
As part of this research, we are developing a model editor in Eclipse using the GMF framework, which will demonstrate our modelling language prototypes.
Once you have installed the plugin and installed PHP, you can try the language with a Hello World application. More documentation is forthcoming.
Version 0.6 of the plugin has been released (September 2011), and can be installed into Eclipse.
More information: http://openiaml.org