Are there any other frameworks (besides Cappucino) for building a desktop-like app in browser?

I would like to build an app which would be very similar to http://gomockingbird.com (will draw the mockups). Are t开发者_运维技巧here any other frameworks, besides Cappucino, for that? I dislike Objective-J syntax and built-in Cappucino pseudo-mac interfaces. Any suggestions?

Check out SproutCore and ExtJS.

If you're looking for drawing frameworks, it will be worth checking out Raphael, which you could use in conjunction with the UI widgets provided by the frameworks Marc mentioned.

Are you aware that http://gomockingbird.com/ is actually built with Cappucino & Objective-J?