gorm.app software package provides Visual Interface Builder for GNUstep, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install gorm.app
gorm.app is installed in your system.
Make ensure the gorm.app package were installed using the commands given below,
$ sudo dpkg-query -l | grep gorm.app *
You will get with gorm.app package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | GNUstep |
| Package | gorm.app |
| Version | 1.2.20-2+b1 |
| Description | Visual Interface Builder for GNUstep |
| Sub Section | gnustep |