GNUstep offers ProjectCenter and Gorm to help develop GNUstep applications, which are similiar to Project Builder and Interface Builder in MacOS X. ProjectCenter is for project management, and Gorm for interface building.

ProjectCenter and Gorm can be found in ftp://ftp.gnustep.org/pub/gnustep/dev-apps/, or gnustep/dev-apps/ from CVS. Use gmake install to install, and openapp ProjectCenter and openapp Gorm to start.