hamster-applet software package provides time tracking applet for GNOME, 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 hamster-applet
hamster-applet is installed in your system.
Make ensure the hamster-applet package were installed using the commands given below,
$ sudo dpkg-query -l | grep hamster-applet *
You will get with hamster-applet package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | GNOME |
| Package | hamster-applet |
| Version | 2.91.3+git20120514.b9fec3e1-1 |
| Description | time tracking applet for GNOME |
| Sub Section | gnome |