freeglut3 software package provides OpenGL Utility Toolkit, 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 freeglut3
freeglut3 is installed in your system.
Make ensure the freeglut3 package were installed using the commands given below,
$ sudo dpkg-query -l | grep freeglut3 *
You will get with freeglut3 package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Libraries |
| Package | freeglut3 |
| Version | 2.8.1-3 |
| Description | OpenGL Utility Toolkit |
| Sub Section | Libs |