diff --git a/flake.lock b/flake.lock
index 4de13ed..87779ed 100644
--- a/flake.lock
+++ b/flake.lock
@@ -305,6 +305,26 @@
         "type": "github"
       }
     },
+    "darwin": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1709771483,
+        "narHash": "sha256-Hjzu9nCknHLQvhdaRFfCEprH0o15KcaNu1QDr3J88DI=",
+        "owner": "lnl7",
+        "repo": "nix-darwin",
+        "rev": "550340062c16d7ef8c2cc20a3d2b97bcd3c6b6f6",
+        "type": "github"
+      },
+      "original": {
+        "owner": "lnl7",
+        "repo": "nix-darwin",
+        "type": "github"
+      }
+    },
     "dashboard-nvim": {
       "flake": false,
       "locked": {
@@ -767,6 +787,22 @@
         "type": "github"
       }
     },
+    "gpg-base-conf": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1710110429,
+        "narHash": "sha256-sW7crQEhoGslXyO9djBuPYf1DFqTo5uYUEFkaSCw1xc=",
+        "owner": "drduh",
+        "repo": "config",
+        "rev": "702281406b1f491b805d8e380dc03d73ace517f3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "drduh",
+        "repo": "config",
+        "type": "github"
+      }
+    },
     "highlight-undo": {
       "flake": false,
       "locked": {
@@ -1972,7 +2008,9 @@
     },
     "root": {
       "inputs": {
+        "darwin": "darwin",
         "disko": "disko",
+        "gpg-base-conf": "gpg-base-conf",
         "home-manager": "home-manager",
         "lanzaboote": "lanzaboote",
         "neovim-flake": "neovim-flake",
@@ -1980,7 +2018,8 @@
         "nixsgx-flake": "nixsgx-flake",
         "snowfall-lib": "snowfall-lib_2",
         "sops-nix": "sops-nix",
-        "unstable": "unstable"
+        "unstable": "unstable",
+        "yubikey-guide": "yubikey-guide"
       }
     },
     "rust-overlay": {
@@ -2587,6 +2626,22 @@
         "type": "github"
       }
     },
+    "yubikey-guide": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1710173432,
+        "narHash": "sha256-bzoO+sxhaC8P513XpxmYXhb/rRt3Qc6q65m8sn++5/s=",
+        "owner": "drduh",
+        "repo": "YubiKey-Guide",
+        "rev": "12b232d28fbb6ea61ccff2075751105c77ca84ee",
+        "type": "github"
+      },
+      "original": {
+        "owner": "drduh",
+        "repo": "YubiKey-Guide",
+        "type": "github"
+      }
+    },
     "zig": {
       "inputs": {
         "flake-compat": "flake-compat_2",
diff --git a/flake.nix b/flake.nix
index 2d1fe82..0343963 100644
--- a/flake.nix
+++ b/flake.nix
@@ -17,18 +17,35 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
 
-    neovim-flake.url = "github:notashelf/neovim-flake/v0.5";
-    neovim-flake.inputs.nixpkgs.follows = "nixpkgs";
+    # macOS Support (master)
+    darwin.url = "github:lnl7/nix-darwin";
+    darwin.inputs.nixpkgs.follows = "nixpkgs";
 
     home-manager.url = "github:nix-community/home-manager/release-23.11";
     home-manager.inputs.nixpkgs.follows = "nixpkgs";
 
+    neovim-flake.url = "github:notashelf/neovim-flake/v0.5";
+    neovim-flake.inputs.nixpkgs.follows = "nixpkgs";
+
     disko.url = "github:nix-community/disko";
     disko.inputs.nixpkgs.follows = "nixpkgs";
 
     sops-nix.url = "github:Mic92/sops-nix";
     sops-nix.inputs.nixpkgs.follows = "nixpkgs";
 
+    # GPG default configuration
+    gpg-base-conf = {
+      url = "github:drduh/config";
+      flake = false;
+    };
+
+    # Yubikey Guide
+    yubikey-guide = {
+      url = "github:drduh/YubiKey-Guide";
+      flake = false;
+    };
+
+
     nixsgx-flake = {
       url = "github:matter-labs/nixsgx";
       # inputs.nixpkgs.follows = "nixpkgs";
diff --git a/homes/x86_64-darwin/harald@mpro.fritz.box/default.nix b/homes/x86_64-darwin/harald@mpro/default.nix
similarity index 80%
rename from homes/x86_64-darwin/harald@mpro.fritz.box/default.nix
rename to homes/x86_64-darwin/harald@mpro/default.nix
index ec02ea3..9ed2669 100644
--- a/homes/x86_64-darwin/harald@mpro.fritz.box/default.nix
+++ b/homes/x86_64-darwin/harald@mpro/default.nix
@@ -1,9 +1,6 @@
 { lib
 , pkgs
 , config
-, nixpkgs
-, osConfig ? { }
-, format ? "unknown"
 , ...
 }:
 {
@@ -25,14 +22,10 @@
       home-manager.enable = true;
     };
     tools = {
-      git.enable = true;
       direnv.enable = true;
       alacritty.enable = true;
       ssh.enable = true;
-      # jetbrains.enable = true;
     };
   };
-
-  fonts.fontconfig.enable = true;
 }
 
diff --git a/homes/x86_64-linux/harald@sgx-azure/default.nix b/homes/x86_64-linux/harald@sgx-azure/default.nix
index e01b032..9667487 100644
--- a/homes/x86_64-linux/harald@sgx-azure/default.nix
+++ b/homes/x86_64-linux/harald@sgx-azure/default.nix
@@ -1,7 +1,6 @@
 { lib
 , pkgs
 , config
-, nixpkgs
 , ...
 }:
 {
diff --git a/homes/x86_64-linux/harald@sgx-nixos/default.nix b/homes/x86_64-linux/harald@sgx-nixos/default.nix
index 68f018f..1c9175e 100644
--- a/homes/x86_64-linux/harald@sgx-nixos/default.nix
+++ b/homes/x86_64-linux/harald@sgx-nixos/default.nix
@@ -1,4 +1,7 @@
-{ config, ... }:
+{ lib
+, config
+, ...
+}:
 {
   home.sessionPath = [ "$HOME/bin" ];
 
diff --git a/homes/x86_64-linux/harald@sgx/default.nix b/homes/x86_64-linux/harald@sgx/default.nix
index 68f018f..1c9175e 100644
--- a/homes/x86_64-linux/harald@sgx/default.nix
+++ b/homes/x86_64-linux/harald@sgx/default.nix
@@ -1,4 +1,7 @@
-{ config, ... }:
+{ lib
+, config
+, ...
+}:
 {
   home.sessionPath = [ "$HOME/bin" ];
 
diff --git a/homes/x86_64-linux/harald@x1/default.nix b/homes/x86_64-linux/harald@x1/default.nix
index b56064c..c1d73cf 100644
--- a/homes/x86_64-linux/harald@x1/default.nix
+++ b/homes/x86_64-linux/harald@x1/default.nix
@@ -1,4 +1,5 @@
-{ config
+{ lib
+, config
 , ...
 }:
 {
diff --git a/modules/darwin/home/default.nix b/modules/darwin/home/default.nix
new file mode 100644
index 0000000..ccbd39e
--- /dev/null
+++ b/modules/darwin/home/default.nix
@@ -0,0 +1,40 @@
+{ options, config, pkgs, lib, inputs, ... }:
+
+with lib;
+with lib.plusultra;
+let
+  cfg = config.plusultra.home;
+in
+{
+  # imports = with inputs; [
+  #   home-manager.darwinModules.home-manager
+  # ];
+
+  options.plusultra.home = with types; {
+    file = mkOpt attrs { }
+      "A set of files to be managed by home-manager's <option>home.file</option>.";
+    configFile = mkOpt attrs { }
+      "A set of files to be managed by home-manager's <option>xdg.configFile</option>.";
+    extraOptions = mkOpt attrs { } "Options to pass directly to home-manager.";
+    homeConfig = mkOpt attrs { } "Final config for home-manager.";
+  };
+
+  config = {
+    plusultra.home.extraOptions = {
+      home.stateVersion = mkDefault "23.11";
+      home.file = mkAliasDefinitions options.plusultra.home.file;
+      xdg.enable = true;
+      xdg.configFile = mkAliasDefinitions options.plusultra.home.configFile;
+    };
+
+    snowfallorg.users.${config.plusultra.user.name}.home.config = mkAliasDefinitions options.plusultra.home.extraOptions;
+
+    home-manager = {
+      useUserPackages = true;
+      useGlobalPkgs = true;
+
+      # users.${config.plusultra.user.name} = args:
+      #   mkAliasDefinitions options.plusultra.home.extraOptions;
+    };
+  };
+}
diff --git a/modules/darwin/nix/default.nix b/modules/darwin/nix/default.nix
new file mode 100644
index 0000000..995aebc
--- /dev/null
+++ b/modules/darwin/nix/default.nix
@@ -0,0 +1,74 @@
+{ options
+, config
+, pkgs
+, lib
+, ...
+}:
+with lib;
+with lib.plusultra; let
+  cfg = config.plusultra.nix;
+in
+{
+  options.plusultra.nix = with types; {
+    enable = mkBoolOpt true "Whether or not to manage nix configuration.";
+    package = mkOpt package pkgs.nixUnstable "Which nix package to use.";
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = with pkgs; [
+      deploy-rs
+      nixfmt
+      nix-index
+      nix-prefetch-git
+    ];
+
+    nix =
+      let
+        users = [ "root" config.plusultra.user.name ];
+      in
+      {
+        package = cfg.package;
+
+        settings = {
+          experimental-features = "nix-command flakes";
+          http-connections = 50;
+          warn-dirty = false;
+          log-lines = 50;
+
+          # Large builds apparently fail due to an issue with darwin:
+          # https://github.com/NixOS/nix/issues/4119
+          sandbox = false;
+
+          # This appears to break on darwin
+          # https://github.com/NixOS/nix/issues/7273
+          auto-optimise-store = false;
+
+          allow-import-from-derivation = true;
+
+          trusted-users = users;
+          allowed-users = users;
+
+          # NOTE: This configuration is generated by nix-installer so I'm adding it here in
+          # case it becomes important.
+          extra-nix-path = "nixpkgs=flake:nixpkgs";
+          build-users-group = "nixbld";
+        };
+        #// (lib.optionalAttrs config.plusultra.tools.direnv.enable {
+        #  keep-outputs = true;
+        #  keep-derivations = true;
+        #});
+
+        gc = {
+          automatic = true;
+          interval = { Day = 7; };
+          options = "--delete-older-than 30d";
+          user = config.plusultra.user.name;
+        };
+
+        # flake-utils-plus
+        generateRegistryFromInputs = true;
+        generateNixPathFromInputs = true;
+        linkInputs = true;
+      };
+  };
+}
diff --git a/modules/darwin/security/gpg/default.nix b/modules/darwin/security/gpg/default.nix
new file mode 100644
index 0000000..45b11d2
--- /dev/null
+++ b/modules/darwin/security/gpg/default.nix
@@ -0,0 +1,85 @@
+{ lib, config, pkgs, inputs, ... }:
+
+let
+  inherit (lib) types mkEnableOption mkIf;
+  inherit (lib.plusultra) mkOpt;
+
+  cfg = config.plusultra.security.gpg;
+  gpg = config.plusultra.security.gpg;
+  user = config.plusultra.user;
+  gpgConf = "${inputs.gpg-base-conf}/gpg.conf";
+
+  gpgAgentConf = ''
+    enable-ssh-support
+    default-cache-ttl 60
+    max-cache-ttl 120
+  '';
+
+  guide = "${inputs.yubikey-guide}/README.md";
+
+  theme = pkgs.fetchFromGitHub {
+    owner = "jez";
+    repo = "pandoc-markdown-css-theme";
+    rev = "019a4829242937761949274916022e9861ed0627";
+    sha256 = "1h48yqffpaz437f3c9hfryf23r95rr319lrb3y79kxpxbc9hihxb";
+  };
+
+  guideHTML = pkgs.runCommand "yubikey-guide" { } ''
+    ${pkgs.pandoc}/bin/pandoc \
+      --standalone \
+      --metadata title="Yubikey Guide" \
+      --from markdown \
+      --to html5+smart \
+      --toc \
+      --template ${theme}/template.html5 \
+      --css ${theme}/docs/css/theme.css \
+      --css ${theme}/docs/css/skylighting-solarized-theme.css \
+      -o $out \
+      ${guide}
+  '';
+
+  reload-yubikey = pkgs.writeShellScriptBin "reload-yubikey" ''
+    ${pkgs.gnupg}/bin/gpg-connect-agent "scd serialno" "learn --force" /bye
+  '';
+in
+{
+  options.plusultra.security.gpg = {
+    enable = mkEnableOption "GPG";
+    agentTimeout = mkOpt types.int 5 "The amount of time to wait before continuing with shell init.";
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = with pkgs; [
+      gnupg
+    ];
+
+    environment.shellInit = ''
+      export GPG_TTY="$(tty)"
+      export SSH_AUTH_SOCK=$(${pkgs.gnupg}/bin/gpgconf --list-dirs agent-ssh-socket)
+
+      ${pkgs.coreutils}/bin/timeout ${builtins.toString cfg.agentTimeout} ${pkgs.gnupg}/bin/gpgconf --launch gpg-agent
+      gpg_agent_timeout_status=$?
+
+      if [ "$gpg_agent_timeout_status" = 124 ]; then
+        # Command timed out...
+        echo "GPG Agent timed out..."
+        echo 'Run "gpgconf --launch gpg-agent" to try and launch it again.'
+      fi
+    '';
+
+    programs.gnupg.agent = {
+      enable = true;
+      enableSSHSupport = true;
+    };
+
+    plusultra.home.file = {
+      ".gnupg/.keep".text = "";
+
+      ".gnupg/yubikey-guide.md".source = guide;
+      ".gnupg/yubikey-guide.html".source = guideHTML;
+
+      ".gnupg/gpg.conf".source = gpgConf;
+      ".gnupg/gpg-agent.conf".text = gpgAgentConf;
+    };
+  };
+}
diff --git a/modules/darwin/services/nix-daemon/default.nix b/modules/darwin/services/nix-daemon/default.nix
new file mode 100644
index 0000000..020ea6d
--- /dev/null
+++ b/modules/darwin/services/nix-daemon/default.nix
@@ -0,0 +1,17 @@
+{ lib, config, ... }:
+
+let
+  inherit (lib) types mkIf;
+  inherit (lib.plusultra) mkOpt enabled;
+
+  cfg = config.plusultra.services.nix-daemon;
+in
+{
+  options.plusultra.services.nix-daemon = {
+    enable = mkOpt types.bool true "Whether to enable the Nix daemon.";
+  };
+
+  config = mkIf cfg.enable {
+    services.nix-daemon = enabled;
+  };
+}
diff --git a/modules/darwin/suites/common/default.nix b/modules/darwin/suites/common/default.nix
new file mode 100644
index 0000000..29230c0
--- /dev/null
+++ b/modules/darwin/suites/common/default.nix
@@ -0,0 +1,39 @@
+{ options, config, lib, pkgs, ... }:
+
+with lib;
+with lib.plusultra;
+let
+  cfg = config.plusultra.suites.common;
+in
+{
+  options.plusultra.suites.common = with types; {
+    enable = mkBoolOpt false "Whether or not to enable common configuration.";
+  };
+
+  config = mkIf cfg.enable {
+    programs.fish = enabled;
+
+    plusultra = {
+      nix = enabled;
+
+      #cli-apps = {
+      #  neovim = enabled;
+      #};
+
+      tools = {
+        git = enabled;
+        #flake = enabled;
+      };
+
+      system = {
+        fonts = enabled;
+        #input = enabled;
+        interface = enabled;
+      };
+
+      security = {
+        gpg = enabled;
+      };
+    };
+  };
+}
diff --git a/modules/darwin/suites/development/default.nix b/modules/darwin/suites/development/default.nix
new file mode 100644
index 0000000..17b8779
--- /dev/null
+++ b/modules/darwin/suites/development/default.nix
@@ -0,0 +1,35 @@
+{ options, config, lib, pkgs, ... }:
+
+with lib;
+with lib.plusultra;
+let
+  cfg = config.plusultra.suites.development;
+in
+{
+  options.plusultra.suites.development = with types; {
+    enable = mkBoolOpt false
+      "Whether or not to enable common development configuration.";
+  };
+
+  config = mkIf cfg.enable {
+    plusultra = {
+      #apps = {
+      #  vscode = enabled;
+      #};
+
+      tools = {
+        # at = enabled;
+        # direnv = enabled;
+        # go = enabled;
+        # http = enabled;
+        # k8s = enabled;
+        # node = enabled;
+        # titan = enabled;
+        # python = enabled;
+        # java = enabled;
+      };
+
+      # virtualisation = { podman = enabled; };
+    };
+  };
+}
diff --git a/modules/darwin/system/fonts/default.nix b/modules/darwin/system/fonts/default.nix
new file mode 100644
index 0000000..b1483e0
--- /dev/null
+++ b/modules/darwin/system/fonts/default.nix
@@ -0,0 +1,32 @@
+{ options, config, pkgs, lib, ... }:
+
+with lib;
+with lib.plusultra;
+let cfg = config.plusultra.system.fonts;
+in
+{
+  options.plusultra.system.fonts = with types; {
+    enable = mkBoolOpt false "Whether or not to manage fonts.";
+    fonts = mkOpt (listOf package) [ ] "Custom font packages to install.";
+  };
+
+  config = mkIf cfg.enable {
+    environment.variables = {
+      # Enable icons in tooling since we have nerdfonts.
+      LOG_ICONS = "true";
+    };
+
+    fonts = {
+      fontDir = enabled;
+
+      fonts = with pkgs;
+        [
+          noto-fonts
+          noto-fonts-cjk-sans
+          noto-fonts-cjk-serif
+          noto-fonts-emoji
+          (nerdfonts.override { fonts = [ "Hack" ]; })
+        ] ++ cfg.fonts;
+    };
+  };
+}
diff --git a/modules/darwin/system/interface/default.nix b/modules/darwin/system/interface/default.nix
new file mode 100644
index 0000000..4ecfdf5
--- /dev/null
+++ b/modules/darwin/system/interface/default.nix
@@ -0,0 +1,29 @@
+{ options, config, pkgs, lib, ... }:
+
+with lib;
+with lib.plusultra;
+let cfg = config.plusultra.system.interface;
+in
+{
+  options.plusultra.system.interface = with types; {
+    enable = mkEnableOption "macOS interface";
+  };
+
+  config = mkIf cfg.enable {
+    system.defaults = {
+      dock.autohide = true;
+
+      finder = {
+        AppleShowAllExtensions = true;
+        FXEnableExtensionChangeWarning = false;
+      };
+
+      NSGlobalDomain = {
+        _HIHideMenuBar = true;
+        AppleShowScrollBars = "Always";
+      };
+    };
+
+    plusultra.home.file.".hushlogin".text = "";
+  };
+}
diff --git a/modules/darwin/tools/flake/default.nix b/modules/darwin/tools/flake/default.nix
new file mode 100644
index 0000000..9f50aee
--- /dev/null
+++ b/modules/darwin/tools/flake/default.nix
@@ -0,0 +1,18 @@
+{ lib, config, pkgs, ... }:
+
+with lib;
+with lib.plusultra;
+let
+  cfg = config.plusultra.tools.flake;
+in
+{
+  options.plusultra.tools.flake = {
+    enable = mkEnableOption "Flake";
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = with pkgs; [
+      snowfallorg.flake
+    ];
+  };
+}
diff --git a/modules/darwin/tools/git/default.nix b/modules/darwin/tools/git/default.nix
new file mode 100644
index 0000000..8a2d8f1
--- /dev/null
+++ b/modules/darwin/tools/git/default.nix
@@ -0,0 +1,62 @@
+{ options, config, pkgs, lib, ... }:
+
+with lib;
+with lib.plusultra;
+let
+  cfg = config.plusultra.tools.git;
+  gpg = config.plusultra.security.gpg;
+  user = config.plusultra.user;
+in
+{
+  options.plusultra.tools.git = with types; {
+    enable = mkEnableOption "Git";
+    userName = mkOpt types.str user.fullName "The name to configure git with.";
+    userEmail = mkOpt types.str user.email "The email to configure git with.";
+    signingKey =
+      mkOpt types.str "7F3D64824AC0B6B8009E50504BC0896FB5693595" "The key ID to sign commits with.";
+    signByDefault = mkOpt types.bool false "Whether to sign commits by default.";
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = with pkgs; [ git ];
+    plusultra.home.extraOptions = {
+      programs.git = {
+        enable = true;
+        inherit (cfg) userName userEmail;
+        lfs = enabled;
+        signing = {
+          key = cfg.signingKey;
+          signByDefault = mkIf gpg.enable true;
+        };
+
+        extraConfig = {
+          init = { defaultBranch = "main"; };
+          pull = { rebase = true; };
+          push = { autoSetupRemote = true; };
+          core = { whitespace = "trailing-space,space-before-tab"; };
+          safe = {
+            directory = "${config.users.users.${user.name}.home}/git";
+          };
+          "credential \"https://github.com\"" = {
+            helper = "!gh auth git-credential";
+          };
+          alias = {
+            co = "checkout";
+            ci = "commit --signoff";
+          };
+          pull.ff = "only";
+          core.pager = "${pkgs.delta}/bin/delta";
+          delta = {
+            features = "decorations";
+            syntax-theme = "Dracula";
+            light = "false";
+            navigate = "true";
+          };
+          interactive.diffFilter = "${pkgs.delta}/bin/delta --color-only";
+          merge.conflictStyle = "diff3";
+          diff.colorMoved = "default";
+        };
+      };
+    };
+  };
+}
diff --git a/modules/darwin/tools/java/default.nix b/modules/darwin/tools/java/default.nix
new file mode 100644
index 0000000..aa51095
--- /dev/null
+++ b/modules/darwin/tools/java/default.nix
@@ -0,0 +1,17 @@
+{ options, config, lib, pkgs, ... }:
+
+with lib;
+with lib.plusultra;
+let cfg = config.plusultra.tools.java;
+in
+{
+  options.plusultra.tools.java = with types; {
+    enable = mkBoolOpt false "Whether or not to enable Java.";
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = with pkgs; [
+      jdk
+    ];
+  };
+}
diff --git a/modules/darwin/tools/node/default.nix b/modules/darwin/tools/node/default.nix
new file mode 100644
index 0000000..9a70afd
--- /dev/null
+++ b/modules/darwin/tools/node/default.nix
@@ -0,0 +1,42 @@
+{ options
+, config
+, pkgs
+, lib
+, ...
+}:
+with lib;
+with lib.plusultra; let
+  cfg = config.plusultra.tools.node;
+in
+{
+  options.plusultra.tools.node = with types; {
+    enable = mkBoolOpt false "Whether or not to install and configure git";
+    pkg = mkOpt package pkgs.nodejs "The NodeJS package to use";
+    prettier = {
+      enable = mkBoolOpt true "Whether or not to install Prettier";
+      pkg =
+        mkOpt package pkgs.nodePackages.prettier "The NodeJS package to use";
+    };
+    yarn = {
+      enable = mkBoolOpt true "Whether or not to install Yarn";
+      pkg = mkOpt package pkgs.nodePackages.yarn "The NodeJS package to use";
+    };
+    pnpm = {
+      enable = mkBoolOpt true "Whether or not to install Pnpm";
+      pkg = mkOpt package pkgs.nodePackages.pnpm "The NodeJS package to use";
+    };
+    flyctl = {
+      enable = mkBoolOpt true "Whether or not to install flyctl";
+      pkg = mkOpt package pkgs.flyctl "The flyctl package to use";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = with pkgs;
+      [ cfg.pkg ]
+      ++ (lib.optional cfg.prettier.enable cfg.prettier.pkg)
+      ++ (lib.optional cfg.yarn.enable cfg.yarn.pkg)
+      ++ (lib.optional cfg.pnpm.enable cfg.pnpm.pkg)
+      ++ (lib.optional cfg.flyctl.enable cfg.flyctl.pkg);
+  };
+}
diff --git a/modules/darwin/tools/python/default.nix b/modules/darwin/tools/python/default.nix
new file mode 100644
index 0000000..34de5a8
--- /dev/null
+++ b/modules/darwin/tools/python/default.nix
@@ -0,0 +1,22 @@
+{ options, config, lib, pkgs, ... }:
+
+with lib;
+with lib.plusultra;
+let cfg = config.plusultra.tools.python;
+in
+{
+  options.plusultra.tools.python = with types; {
+    enable = mkBoolOpt false "Whether or not to enable Python.";
+  };
+
+  config =
+    mkIf cfg.enable {
+      environment.systemPackages = with pkgs; [
+        (python311.withPackages (ps:
+          with ps; [
+            numpy
+          ])
+        )
+      ];
+    };
+}
diff --git a/modules/darwin/user/default.nix b/modules/darwin/user/default.nix
new file mode 100644
index 0000000..1554974
--- /dev/null
+++ b/modules/darwin/user/default.nix
@@ -0,0 +1,45 @@
+{ lib
+, config
+, pkgs
+, ...
+}:
+let
+  inherit (lib) types mkIf mkDefault;
+  inherit (lib.plusultra) mkOpt;
+
+  cfg = config.plusultra.user;
+
+  is-linux = pkgs.stdenv.isLinux;
+  is-darwin = pkgs.stdenv.isDarwin;
+in
+{
+  options.plusultra.user = {
+    name = mkOpt types.str "harald" "The user account.";
+
+    fullName = mkOpt types.str "Harald Hoyer" "The full name of the user.";
+    email = mkOpt types.str "harald@hoyer.xyz" "The email of the user.";
+
+    uid = mkOpt (types.nullOr types.int) 501 "The uid for the user account.";
+  };
+
+  config = {
+    users.users.${cfg.name} = {
+      # NOTE: Setting the uid here is required for another
+      # module to evaluate successfully since it reads
+      # `users.users.${plusultra.user.name}.uid`.
+      uid = mkIf (cfg.uid != null) cfg.uid;
+    };
+
+    snowfallorg.users.${config.plusultra.user.name}.home.config = {
+      home = {
+        file = {
+          ".profile".text = ''
+            # The default file limit is far too low and throws an error when rebuilding the system.
+            # See the original with: ulimit -Sa
+            ulimit -n 4096
+          '';
+        };
+      };
+    };
+  };
+}
diff --git a/modules/home/cli-apps/home-manager/default.nix b/modules/home/cli-apps/home-manager/default.nix
index ab7ae34..27783ce 100644
--- a/modules/home/cli-apps/home-manager/default.nix
+++ b/modules/home/cli-apps/home-manager/default.nix
@@ -18,12 +18,13 @@ in
       BATDIFF_USE_DELTA = "true";
     };
 
+/*
     home.shellAliases = {
       cat = "${pkgs.bat}/bin/bat --decorations never";
       less = ''${pkgs.bat}/bin/bat --decorations never --paging=always --pager "${pkgs.less}/bin/less -RF"'';
       man = "${pkgs.bat-extras.batman}/bin/batman";
     };
-
+*/
     home.packages = with pkgs; [
       vim
     ];
diff --git a/modules/nixos/tools/git/default.nix b/modules/nixos/tools/git/default.nix
index d0ebf79..a963f0d 100644
--- a/modules/nixos/tools/git/default.nix
+++ b/modules/nixos/tools/git/default.nix
@@ -41,15 +41,14 @@ in
           };
           alias = {
             co = "checkout";
-            ci = "commit";
+            ci = "commit --signoff";
           };
           pull.ff = "only";
           core.pager = "${pkgs.delta}/bin/delta";
           delta = {
-            features = "side-by-side line-numbers decorations";
-            syntax-theme = "DarkNeon";
+            features = "decorations";
+            syntax-theme = "Dracula";
             light = "false";
-            line-numbers = "false";
             navigate = "true";
           };
           interactive.diffFilter = "${pkgs.delta}/bin/delta --color-only";
diff --git a/systems/x86_64-darwin/mpro/default.nix b/systems/x86_64-darwin/mpro/default.nix
new file mode 100644
index 0000000..054a38e
--- /dev/null
+++ b/systems/x86_64-darwin/mpro/default.nix
@@ -0,0 +1,17 @@
+{ lib, pkgs, ... }:
+
+with lib.plusultra;
+{
+  plusultra = {
+    suites = {
+      common = enabled;
+      development = enabled;
+    };
+  };
+
+  environment.systemPath = [
+    "/usr/local/Homebrew/bin"
+  ];
+
+  system.stateVersion = 4;
+}
diff --git a/systems/x86_64-linux/sgx/default.nix b/systems/x86_64-linux/sgx/default.nix
index f53bc16..5eeeb5a 100644
--- a/systems/x86_64-linux/sgx/default.nix
+++ b/systems/x86_64-linux/sgx/default.nix
@@ -21,7 +21,7 @@ with lib.plusultra;
 
   virtualisation.docker.enable = true;
   virtualisation.podman.dockerCompat = false;
-  
+
   system.autoUpgrade = {
     enable = true;
     operation = "boot";