Frameworks
Core frameworks
Base - Foundation kit
GUI - Application kit
Extension frameworks
(official part of GNUstep)
GDL2 - Database frameworks (Enterprise Objects/EO)
StepTalk - Scripting framework
GSWeb - Web Objects framework
Other frameworks
(not official parts of GNUstep project)
DevelopmentKit - computer aided development
Bundles
Backend - obligatory bundle for GNUstep backed graphics system
Camaelon - theme bundle
See also: How to make frameworks scriptable