I am excited to announce the first official dot release (0.4) of OpenPyro, the open source UI framework I have been working on (on and off) for the last few months. All the information including source code, samples and documentation can be found at OpenPyro.org. I would love to hear some feedback as well. I am really hoping for this to be community powered and would love to integrate or help integrate more features into the framework, so if you are interested in the project and would like to collaborate, please feel free to contact me via blog comments, Twitter (http://twitter.com/arpit) or via the OpenPyro mailing list. And definitely take a look at the OpenPyro Wiki, which has a bunch of examples, samples and some concepts explained.
The biggest feature in 0.4 is the measurement and layout system that is pretty similar to Flex that I love and a fairly decent component set. Because all OpenPyro components use composition rather than inheritance, I am really hoping to build something very Flex4-esque but keeping filesize . Am also hoping to keep the core library pretty small and create a comprehensive library of functionality using plugins, basically libraries whose functionality depends on OpenPyro but not the other way around. For a full set of development themes check out the section here on the wiki.
I have been writing about OpenPyro on this blog for the last few months as well, all those posts can be found here
Hopefully this can grow into a body of code that the community finds useful.