npm

glade

Visual RAD tool for designing GTK+ and GNOME user interfaces

brewmacoslinux
Try with needOr install directly
Source

About

RAD tool for the GTK+ and GNOME environment

Commands

glade

Examples

Launch Glade GUI designer$ glade
Open an existing Glade project file$ glade myproject.glade
Create a new GTK interface and save it$ glade --new gtkbuilder