I'm curious if anyone has tried (or if it would be possible) to run the Nix package manager in FreeBSD to get/install/run Linux applications in compatibility mode.
Portability
Nix runs on Linux and Mac OS X.
NixOS
NixOS is a Linux distribution based on Nix.
I suppose if you need extra packages you should use pkgsrc (https://www.pkgsrc.org/), although to my knowledge it has half as many packages as FreeBSD's ports collection, or Ravenports (http://www.ravenports.com/), which also has fairly small repos.
I'm curious if anyone has tried (or if it would be possible) to run the Nix package manager in FreeBSD to get/install/run Linux applications in compatibility mode.
The reason I wanted to install and learn Nix was mainly to be able to install more browsers. You solved this problem by mentioning linux-browser-installer.Voltaire I tried a little bit, but it would take a lot of effort to make it work in any meaningful way I believe. Chances are you really need to get into the details of both Nix and FreeBSD. If you are interested in experimenting, we could try looking at it together. Let me know.
As for Brave, I am running this via linux-browser-installer and it works just fine.