GNUstep (GNUstep community site) MetaObject Libraries (includes MPWFoundation, MPWTest, Objective-XML) ObjectiveLib, designed to offer the same functionality to Objective-C programmers that the Standard Template Library offers to C++ programmers Objective-C Foundation Classes mGSTEP, an implementation of the core elements in OPENSTEP/Cocoa Cocotron, an easy to use cross-platform solution for Objec