Cocoa
Libraries to interface with the Mac OS X Cocoa GUI API:
  • CL-ObjC - CL-OBJC is a portable common-lisp/objective-c bridge written using CFFI
  • Objective-CL - Objective-CL is a Common-Lisp/Objective-C bridge currently supporting a range of Lisp implementations on Mac OS X and GNUstep
  • XMLisp - XMLisp uses CLOS and the MOP in such a way as to read XML files into Lisp objects