directvnc software package provides VNC client using the framebuffer as display, 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 directvnc
directvnc is installed in your system.
Make ensure the directvnc package were installed using the commands given below,
$ sudo dpkg-query -l | grep directvnc *
You will get with directvnc package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Miscellaneous |
| Package | directvnc |
| Version | 0.7.7-1+b2 [amd64, arm64, arme |
| Description | VNC client using the framebuffer as display |
| Sub Section | Miscellaneous |