Some of the GNUstep presentations I gave over the years at Fosdem. They are in pdf or odp format.
This presentation introduces the new Objective-C features of GCC 4.6.
This presentation explores the free tools that the GNUstep project provides for writing cross-platform Objective-C software.
This presentation introduces server application development using Objective-C and GNUstep.
This presentation was written to introduce the version 2.0.0 of gnustep-make. It also provides some background on the earlier history of gnustep-make.