Renaissance. Welcome to GNUstep Renaissance!
GNUstep Renaissance is free software (GNU LGPL), and part of the GNUstep project. It is a development framework which runs on top of the GNUstep libraries or on top of the Apple Mac OS X Cocoa frameworks, providing an opaque layer to write portable applications. GNUstep Renaissance is mostly useful to: write GUIs for GNUstep and Apple Cocoa in an open, portable format. The GUIs are described by an open, simple, human-editable XML file which works on GNUstep (GNU/Linux, *BSD), GNUstep (Windows) and Apple Cocoa. generate GUIs for GNUstep and Apple Cocoa programmatically.
CocoaReverseEngineering - Wikir. ActionStep.org. Todd Ditchendorf’s Blog.