I code in as3, php, and js as well. What's your opinion of PHP open source frameworks like CodeIgniter, Kohana, and Symfony? Or perhaps, to take a language that

I code in as3, php, and js as well. What's your opinion of PHP open source frameworks like CodeIgniter, Kohana, and Symfony? Or perhaps, to take a language that I don't code in but is often lauded, RoR? Or, on the JS side, have you seen this: http://javascriptmvc.com/ http://javascriptmvc.com/ I'm very curious what your opinion (as a C# dev) is on these. My dad loves .NET (and I think rightly so), but often has (what I think to be) a bit of an outdated stance on open source that is mostly borne of a lack of knowledge of the extant options.