More abou development tools: http://www.gnustep.org/experience/DeveloperTools.html
Gorm stands for "Graphical Object Relationship Modeller" and is GNUstep's easy-to-use interface designer. In the following sections you will learn more about it:
ProjectCenter is GNUstep's integrated developement environment (IDE). It is based in part on NeXT's original Project Builder. It assists you in starting new projects and lets you manage your project files using a intuitive and well ordered graphical user interface.
See also: GNUstep IDE (idea)