'MenuDesigner' - creates windows with buttons, Arexx support, Read tooltypes from cli
These are for Arexx (OK, it's not cli but maybe of interest too...)
BGUI+RexxBGUI - MUI-like Gui designer use RexxBGUI for create GUI's in scripts
ZEDrexx - Shareware; create GUI from ARexx scripts
They're all on Aminet
i have a look on this thread, maybe i found a nicer one