So many new UI frameworks, yet no one really mentioned SmartClient.com (LGPL licensed). I've been using it for almost 10 years and some of the concepts they pi

So many new UI frameworks, yet no one really mentioned SmartClient.com (LGPL licensed). I've been using it for almost 10 years and some of the concepts they pioneered have only recently been discovered by the new kids. I still use it, though some of the 'fixes' they had to put in place to support old browsers are often polluting the DOM unnecessarily in modern browsers (this is something I hope they fixed). My favourite aspects of it are that I can declare components declaratively, it has a technique called autoChildren that allows managing a tree of components as a flat set (useful for complex components like tabsets), and the data binding layer. The documentation is top notch (which it needs to be given the depth of stuff in there). Again, all of this was around in 2009 since when I started using it - and not sure how many years before I found it they'd been going.