Objective-C
Objective-C adds object-oriented features to the C programming language. It is commonly used on Apple's Mac OS X and iOS. There are some differences between using the Apple/Cocoa runtime environment as compared to using the GCC compiler and the GNUstep runtime environment.
Reference documents
- Objective-C GNUstep manual
- Objective-C tutorial by Noah Roberts
- GNUstep Base class library reference
- GNUstep Base Additions class library reference
- Objective-C reference from NeXT Software (published in 1996)
- Frequently asked questions about Objective-C
- LibGB drawing functions
- Brief C reference by Eric Huss
- C and C++ reference by Nate Kohl
http://hughesbennett.co.uk/ObjectiveC