I've asked a similar question a while back (actually nearly 1 year)...back then I was looking for a good widget library, generated from server-side in PHP. The most interesting candidate I find was PHP-ext, but the project seems pretty much dead.
So one year later, is there any new open source project of that kind ? Or any widget (PHP-driven) that you use and find useful ?
Edit : Just to make it clear, what I'm looking for is a set of standalone (that I can use without having to embrace a whole framework) PHP classes or libraries to handle the generation of client-side (HTML+CSS+JS) widgets.