RAD tool for Mac OS X. Is there any?

Question

I wonder if there is any RAD tool for Mac OS X. Something like Delphi for Windows.

Answer 1

Lazarus is an IDE for Free Pascal that works on Mac OS X (among other platforms). Obligatory screenshot here.

Note: Lazarus supports two widget sets (Carbon and QT), with a third in Alpha (COCOA), most screenshots will be of the Carbon port nowadays.

Answer 2

Which languages are you interested in?

Certainly check out Cocoa, XCode and Interface Builder.