Common Lisp providers offer several possibilities for the development of Graphical user interfaces.

CLIM (Common Lisp Interface Manager) is a portable, high level user interface management system jointly developed by several Lisp vendors, including Franz, Harlequin and Digitool.

There exist also proprietary libraries like Common Graphics ( Franz Inc) and its Interface Builder (visual programming), CAPI ( Xanalysis) portable GUI toolkit, supporting both Windows and OSF/Motif look and feel, Etc.