Based on Debian
In simple terms, Whonix ™ is just a collection of configuration files and scripts. Whonix ™ is not a stripped down version of Debian; anything possible in "vanilla" Debian GNU/Linux can be replicated in Whonix ™. Likewise, most problems and questions can be solved in the same way. For example: "How do I install xrandr on Whonix ™?" -- "The same way as in Debian". Whonix ™ does not break anything, limit functionality, or prevent installation of compatible software.