fvwm-crystal software package provides Pretty Desktop Environment based on FVWM, you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install fvwm-crystal
fvwm-crystal is installed in your system.
Make ensure the fvwm-crystal package were installed using the commands given below,
$ sudo dpkg-query -l | grep fvwm-crystal *
You will get with fvwm-crystal package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | X Window System software |
| Package | fvwm-crystal |
| Version | 3.3.1+dfsg-1 |
| Description | Pretty Desktop Environment based on FVWM |
| Sub Section | x11 |