Interface Builder

From GNUstepWiki

GNUstep's IB implementation, called Gorm, attempts to improve on many of the aspects of the OpenStep Interface Builder. There are some features which are available in Gorm which are not available in IB. For more information about this see the Gorm Manual.

More information about Apple's Interface Builder is here: http://developer.apple.com/tools/interfacebuilder/