Usage

Make the repository available on your machine and include the category you want in /etc/nixos/configuration.nix.

{ config, pkgs, ... }:

{
  imports =
    [
      ./hardware-configuration.nix
      ./port-scanners.nix
    ];
[...]

Or cherry-pick the tools you want and create a new shell. E.g., portscan.nix:

{ pkgs ? import <nixpkgs> {} }:

with pkgs;

mkShell {
  nativeBuildInputs = [
    nmap
    masscan
  ];
}

$ nix-shell portscan.nix