Cocoa
Libraries to interface with the MacOS X Cocoa GUI API:
  • CL-ObjC - CL-OBJC is a portable common-lisp/objective-c bridge written using CFFI
  • objcffi - objcffi is a library to allow the creation of objective-c classes and methods directly in Common Lisp
  • Objective-CL - Objective-CL is a Common-Lisp/Objective-C bridge currently supporting a range of Lisp implementations on Mac OS X and GNUstep