{
  den.aspects = {
    desktop = {
      nixos =
        { pkgs, ... }:
        {
          environment.systemPackages = [
            # ----- xfce tool
            pkgs.xfce.xfce4-appfinder
            pkgs.xfce.xfce4-panel
            pkgs.xfce.xfce4-panel-profiles
            pkgs.xfce.xfce4-genmon-plugin
            pkgs.xfce.xfce4-pulseaudio-plugin
            pkgs.xfce.xfce4-docklike-plugin
            pkgs.xfce.xfce4-xkb-plugin
            # ----- labwc tool (wayland)
            pkgs.labwc-menu-generator
            # ----- openbox tool (x11)
            pkgs.obconf
            # ----- utility
            pkgs.menulibre
            pkgs.xorg.xev
            pkgs.xdg-utils
          ];
        };
      };
    };
}