Kendo UI - a framework for modern HTML UI
I apologize in advance if this opinion offends anyone, but every HTML UI kit that I've seen simply can't hold a candle to  native kits such as WinForms, WPF or even Cocoa. I would really love a write-once browser based solution, but I just can't see that type of solution ever catching up to native tech.<p>How long do we have to wait before the browser can catch up? Do you think it will ever happen?<p>The closest thing that I've ever seen is Silverlight. With it I've been able to make some very excellent front-ends, with EASE, that look and behave identically between Mac and Windows. EDIT: The only challenge with Silverlight has been wheel-scrolling, which works fine on Windows but only works in Out-Of-Browser on the Mac.