{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
    nixpkgsUnstable.url = "github:NixOS/nixpkgs/nixos-unstable";
    nixos-hardware.url = "github:NixOS/nixos-hardware/master";
    home-manager = {
      url = "github:nix-community/home-manager/release-24.11";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    agenix.url = "github:ryantm/agenix";
    simple-nixos-mailserver.url = "gitlab:simple-nixos-mailserver/nixos-mailserver/nixos-24.05";
  };

  outputs =
    {
      nixpkgs,
      nixpkgsUnstable,
      home-manager,
      nixos-hardware,
      agenix,
      simple-nixos-mailserver,
      ...
    }:
    let
      system = "x86_64-linux";
      overlayUnstable = final: prev: {
        unstable = import nixpkgsUnstable {
          inherit system;
          config.allowUnfree = true;
        };
      };
    in
    {
      nixosConfigurations = {
        nixbox = nixpkgs.lib.nixosSystem {
          inherit system;
          modules = [
            agenix.nixosModules.default
            {
              environment.systemPackages = [ agenix.packages.${system}.default ];
            }
            (
              { config, pkgs, ... }:
              {
                nixpkgs.overlays = [ overlayUnstable ];
              }
            )
            home-manager.nixosModules.home-manager
            {
              home-manager.useGlobalPkgs = true;
              home-manager.useUserPackages = true;
            }
            ./hosts/nixbox
          ];
        };
        flynode = nixpkgs.lib.nixosSystem {
          inherit system;
          modules = [
            agenix.nixosModules.default
            {
              environment.systemPackages = [ agenix.packages.${system}.default ];
            }
            (
              { config, pkgs, ... }:
              {
                nixpkgs.overlays = [ overlayUnstable ];
              }
            )
            nixos-hardware.nixosModules.lenovo-thinkpad-z13-gen1
            home-manager.nixosModules.home-manager
            {
              home-manager.useGlobalPkgs = true;
              home-manager.useUserPackages = true;
            }
            ./hosts/flynode
          ];
        };
        thewordnerd = nixpkgs.lib.nixosSystem {
          inherit system;
          modules = [
            agenix.nixosModules.default
            {
              environment.systemPackages = [ agenix.packages.${system}.default ];
            }
            (
              { config, pkgs, ... }:
              {
                nixpkgs.overlays = [ overlayUnstable ];
              }
            )
            home-manager.nixosModules.home-manager
            {
              home-manager.useGlobalPkgs = true;
              home-manager.useUserPackages = true;
            }
            simple-nixos-mailserver.nixosModule
            ./hosts/hub
          ];
        };
        garden = nixpkgs.lib.nixosSystem {
          inherit system;
          modules = [
            agenix.nixosModules.default
            {
              environment.systemPackages = [ agenix.packages.${system}.default ];
            }
            (
              { config, pkgs, ... }:
              {
                nixpkgs.overlays = [ overlayUnstable ];
              }
            )
            ./hosts/garden
          ];
        };
      };
    };
}