CMU Common Lisp has an interface to Motif which is functionally similar to CLM, but works better in CMU CL. See:
This motif interface has been used to write the inspector and graphical debugger. There is also a Lisp control panel with a simple file management facility, apropos and inspector dialogs, and controls for setting global options. See the interface and toolkit packages.
[Function]
interface: lisp-control-panel
This function creates a control panel for the Lisp process.
[Variable]
*interface:*
interface-style
When the graphical interface is loaded, this variable controls whether it is used by inspect and the error system. If the value is :graphics (the default) and the DISPLAY environment variable is defined, the graphical inspector and debugger will be invoked by inspect or when an error is signalled. Possible values are :graphics and tty. If the value is :graphics, but there is no X display, then we quietly use the TTY interface.