{
  description = "Jetperch tools";

  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
  inputs."nixpkgs-24.11".url = "github:nixos/nixpkgs/nixos-24.11";

  outputs = { self, nixpkgs, ... }@inputs: let
    lib = nixpkgs.lib;

    scan = root: pkg: let
      path = ./. + "/${root}";
      entries = lib.optionalAttrs (builtins.pathExists path) (builtins.readDir path);
    in lib.attrsets.foldlAttrs (acc: name: value: acc // lib.optionalAttrs (builtins.pathExists ("${./.}/${root}/${name}/default.nix")) {
      ${name} = pkg name (import "${./.}/${root}/${name}/default.nix");
    }) {} entries;

    overlay = final: prev: let
      all = packages final;
      python3 = prev.python3.override {
        self = python3;
        packageOverrides = pself: psuper: {
          watchdog = psuper.watchdog;
        };
      };
    in { inherit python3; } // all;

    packages = pkgs: scan "package" (name: pkg: (pkgs.extend overlay).callPackage pkg { jetperch = self; inherit name; });
  in {
    packages = builtins.mapAttrs (_: packages) nixpkgs.legacyPackages;
  };
}