gromit software package provides GTK based tool to make annotations on screen, 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 gromit
gromit is installed in your system.
Make ensure the gromit package were installed using the commands given below,
$ sudo dpkg-query -l | grep gromit *
You will get with gromit package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | X Window System software |
| Package | gromit |
| Version | 20041213-9+b1 [armhf], 2004121 |
| Description | GTK based tool to make annotations on screen |
| Sub Section | x11 |