diff --git a/default.nix b/default.nix
index 1dd7720..ef496d5 100644
--- a/default.nix
+++ b/default.nix
@@ -8,168 +8,10 @@
 
 { pkgs ? import <nixpkgs> { } }:
 
-rec {
+import ./pkgs/top-level/all-packages.nix { inherit pkgs; }
+  // {
   # The `lib`, `modules`, and `overlay` names are special
   lib = import ./lib { inherit pkgs; }; # functions
   modules = import ./modules; # NixOS modules
   overlays = import ./overlays; # nixpkgs overlays
-
-  # Alacritty with the unmerged ligature patches applied.
-  alacritty-ligatures = (pkgs.alacritty.override {
-    inherit (pkgs.rustPackages_1_45) rustPlatform;
-  }).overrideAttrs (oldAttrs: rec {
-    pname = "${oldAttrs.pname}-ligatures";
-    version = "0.7.0.20201204";
-
-    src = pkgs.fetchFromGitHub {
-      owner = "zenixls2";
-      repo = "alacritty";
-      fetchSubmodules = true;
-      rev = "9adfaeb01bffb902eb305ed9de376d2032ba994e";
-      sha256 = "0lvynwgjrcrpvywpmqniw27268m0m9lw0lpwnfrbhipyp24c7pnx";
-    };
-
-    cargoDeps = oldAttrs.cargoDeps.overrideAttrs (pkgs.lib.const {
-      name = "${pname}-${version}-vendor.tar.gz";
-      inherit src;
-      outputHash = "1jjyqxpqk5k3kdjb4hmff562j2jncjmpq6wyyi7i3f3v1qc3xsb9";
-    });
-
-    ligatureInputs = [
-      pkgs.fontconfig
-      pkgs.freetype
-      pkgs.libglvnd
-      pkgs.stdenv.cc.cc.lib
-      pkgs.xlibs.libxcb
-    ];
-
-    buildInputs = (oldAttrs.buildInputs or []) ++ ligatureInputs;
-
-    # HACK: One of the ligature libraries required the C++ stdlib at runtime,
-    # and I can't work out a better way to push it to the RPATH.
-    postInstall = pkgs.lib.optional (!pkgs.stdenv.isDarwin) ''
-      patchelf \
-        --set-rpath ${pkgs.lib.makeLibraryPath ligatureInputs}:"$(patchelf --show-rpath $out/bin/alacritty)" \
-        $out/bin/alacritty
-    '';
-  });
-
-  amdgpu-fan = pkgs.callPackage ./pkgs/tools/misc/amdgpu-fan { };
-
-  goModules = pkgs.recurseIntoAttrs rec {
-    qt = pkgs.libsForQt512.callPackage ./pkgs/development/go-modules/qt { };
-  };
-
-  # A functional Jetbrains IDE-with-plugins package set.
-  jetbrains = pkgs.dontRecurseIntoAttrs rec {
-    jetbrainsPluginsFor = variant: import ./pkgs/top-level/jetbrains-plugins.nix {
-      inherit (pkgs) lib newScope stdenv fetchzip;
-      inherit variant;
-    };
-
-    pluginBuild = jetbrainsPlatforms: pkgs.callPackage ./pkgs/build-support/jetbrains/plugin.nix {
-      inherit jetbrains jetbrainsPlatforms;
-    };
-
-    clionPlugins = pkgs.dontRecurseIntoAttrs (jetbrainsPluginsFor pkgs.jetbrains.clion);
-    ideaCommunityPlugins = pkgs.dontRecurseIntoAttrs (jetbrainsPluginsFor pkgs.jetbrains.idea-community);
-    ideaUltimatePlugins = pkgs.dontRecurseIntoAttrs (jetbrainsPluginsFor pkgs.jetbrains.idea-ultimate);
-
-    clionWithPlugins = clionPlugins.jetbrainsWithPlugins;
-    ideaCommunityWithPlugins = ideaCommunityPlugins.jetbrainsWithPlugins;
-    ideaUltimateWithPlugins = ideaUltimatePlugins.jetbrainsWithPlugins;
-  };
-
-  libhl = pkgs.callPackage ./pkgs/development/libraries/libhl { };
-
-  mopidy-subidy = pkgs.callPackage ./pkgs/applications/audio/mopidy/subidy.nix {
-    python3Packages = pkgs.python3Packages // python3Packages;
-  };
-
-  pam_gnupg = pkgs.callPackage ./pkgs/os-specific/linux/pam_gnupg { };
-
-  picom-animations = pkgs.picom.overrideAttrs (oldAttrs: {
-    pname = "picom-animations";
-    src = pkgs.fetchFromGitHub {
-      owner = "jonaburg";
-      repo = "picom";
-      rev = "d718c94";
-      sha256 = "165mc53ryyxn2ybkhikmk51ay3k18mvlsym3am3mgr8cpivmf2rm";
-    };
-  });
-
-  polybar = pkgs.polybar.overrideAttrs (oldAttrs: {
-    # Enables an extra button in formatting, indirectly allowing the use of
-    # the mouse forward and backward buttons.
-    patches = (oldAttrs.patches or [ ]) ++ [ ./pkgs/applications/misc/polybar/9button.patch ];
-  });
-
-  python2Packages =
-    let
-      fixVersion =
-        { package
-        , version
-        , sha256
-        , extra ? (oldAttrs: { })
-        }: package.overrideAttrs (oldAttrs: rec {
-          inherit version;
-          src = pkgs.python2Packages.fetchPypi {
-            inherit (oldAttrs) pname;
-            inherit version sha256;
-          };
-        } // extra oldAttrs);
-    in
-    pkgs.recurseIntoAttrs rec {
-      colorama_0_3_3 = fixVersion {
-        package = pkgs.python2Packages.colorama;
-        version = "0.3.3";
-        sha256 = "1716z9pq1r5ys3nkg7wdrb3h2f9rmd0zdxpxzmx3bgwgf6xg48gb";
-      };
-
-      mutagen_1_30 = fixVersion {
-        package = pkgs.python2Packages.mutagen;
-        version = "1.30";
-        sha256 = "0kv2gjnzbj1w0bswmxm7wi05x6ypi7jk52s0lb8gw8s459j41gyd";
-        extra = oldAttrs: {
-          patches = [ ];
-        };
-      };
-
-      pyspotify_2_0_5 = fixVersion {
-        package = pkgs.python2Packages.pyspotify;
-        version = "2.0.5";
-        sha256 = "0y16c024rrvbvfdqj1n0k4b25b1nbza3i7kspg5b0ci2src1rm7v";
-      };
-
-      overlay = {
-        colorama = colorama_0_3_3;
-        mutagen = mutagen_1_30;
-        pyspotify = pyspotify_2_0_5;
-      };
-    };
-
-  python3Packages = pkgs.recurseIntoAttrs {
-    py-sonic = pkgs.python3.pkgs.callPackage ./pkgs/development/python-modules/py-sonic { };
-  };
-
-  # The one in Nixpkgs still extracts the pre-built Debian package instead
-  # of building from source.
-  protonmailBridgePackages = pkgs.libsForQt512.callPackage ./pkgs/applications/networking/protonmail-bridge {
-    inherit goModules;
-  };
-  protonmail-bridge = protonmailBridgePackages.protonmail-bridge;
-  protonmail-bridge-headless = protonmailBridgePackages.protonmail-bridge-headless;
-
-  radeon-profile-daemon = pkgs.libsForQt5.callPackage ./pkgs/tools/misc/radeon-profile-daemon { };
-
-  samrewritten = pkgs.callPackage ./pkgs/tools/misc/samrewritten { };
-
-  spotify-ripper = pkgs.callPackage ./pkgs/tools/misc/spotify-ripper {
-    # NOTE: Not available in 20.03. Specifying it this way lets me cheat the
-    # build auto-failing on 20.03 because of the attribute not existing.
-    inherit (pkgs) fdk-aac-encoder;
-    python2Packages = pkgs.python2Packages // python2Packages.overlay;
-  };
-
-  zsh-z = pkgs.callPackage ./pkgs/shells/zsh/zsh-z { };
 }
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..26a401a
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,43 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1605370193,
+        "narHash": "sha256-YyMTf3URDL/otKdKgtoMChu4vfVL3vCMkRqpGifhUn0=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "5021eac20303a61fafe17224c087f5519baed54d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1607525610,
+        "narHash": "sha256-u+5o+8ucEGgm8IdC0t/kRm5BA2YEnUCW4PAQzwF1R30=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "253de1fcdb3b82a74a0bf128a7ae2a7b2fed0932",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..21bf0eb
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,34 @@
+{
+  description = "xeals's flake";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    let
+      inherit (flake-utils.lib) defaultSystems flattenTree;
+      inherit (nixpkgs.lib.attrsets) filterAttrs genAttrs mapAttrs;
+    in
+    {
+      nixosModules = mapAttrs (_: path: import path) (import ./modules);
+      overlay = final: prev: {
+        xeals = nixpkgs.lib.composeExtensions self.overlays.pkgs;
+      };
+      overlays = import ./overlays // {
+        pkgs = final: prev: import ./pkgs/top-level/all-packages.nix { pkgs = prev; };
+      };
+      packages = genAttrs defaultSystems
+        (system:
+          let
+            pkgs = nixpkgs.legacyPackages.${system};
+            xPkgs = import ./pkgs/top-level/all-packages.nix { inherit pkgs; };
+          in
+          filterAttrs
+            (attr: drv:
+              builtins.elem system drv.meta.platforms or [ ])
+            xPkgs
+        );
+    };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
new file mode 100644
index 0000000..b989277
--- /dev/null
+++ b/pkgs/top-level/all-packages.nix
@@ -0,0 +1,162 @@
+{ pkgs }:
+
+rec {
+  # Alacritty with the unmerged ligature patches applied.
+  alacritty-ligatures = (pkgs.alacritty.override {
+    inherit (pkgs.rustPackages_1_45) rustPlatform;
+  }).overrideAttrs (oldAttrs: rec {
+    pname = "${oldAttrs.pname}-ligatures";
+    version = "0.7.0.20201204";
+
+    src = pkgs.fetchFromGitHub {
+      owner = "zenixls2";
+      repo = "alacritty";
+      fetchSubmodules = true;
+      rev = "9adfaeb01bffb902eb305ed9de376d2032ba994e";
+      sha256 = "0lvynwgjrcrpvywpmqniw27268m0m9lw0lpwnfrbhipyp24c7pnx";
+    };
+
+    cargoDeps = oldAttrs.cargoDeps.overrideAttrs (pkgs.lib.const {
+      name = "${pname}-${version}-vendor.tar.gz";
+      inherit src;
+      outputHash = "1jjyqxpqk5k3kdjb4hmff562j2jncjmpq6wyyi7i3f3v1qc3xsb9";
+    });
+
+    ligatureInputs = [
+      pkgs.fontconfig
+      pkgs.freetype
+      pkgs.libglvnd
+      pkgs.stdenv.cc.cc.lib
+      pkgs.xlibs.libxcb
+    ];
+
+    buildInputs = (oldAttrs.buildInputs or []) ++ ligatureInputs;
+
+    # HACK: One of the ligature libraries required the C++ stdlib at runtime,
+    # and I can't work out a better way to push it to the RPATH.
+    postInstall = pkgs.lib.optional (!pkgs.stdenv.isDarwin) ''
+      patchelf \
+        --set-rpath ${pkgs.lib.makeLibraryPath ligatureInputs}:"$(patchelf --show-rpath $out/bin/alacritty)" \
+        $out/bin/alacritty
+    '';
+  });
+
+  amdgpu-fan = pkgs.callPackage ../tools/misc/amdgpu-fan { };
+
+  goModules = pkgs.recurseIntoAttrs rec {
+    qt = pkgs.libsForQt512.callPackage ../development/go-modules/qt { };
+  };
+
+  # A functional Jetbrains IDE-with-plugins package set.
+  jetbrains = pkgs.dontRecurseIntoAttrs rec {
+    jetbrainsPluginsFor = variant: import ../top-level/jetbrains-plugins.nix {
+      inherit (pkgs) lib newScope stdenv fetchzip;
+      inherit variant;
+    };
+
+    pluginBuild = jetbrainsPlatforms: pkgs.callPackage ../build-support/jetbrains/plugin.nix {
+      inherit jetbrains jetbrainsPlatforms;
+    };
+
+    clionPlugins = pkgs.dontRecurseIntoAttrs (jetbrainsPluginsFor pkgs.jetbrains.clion);
+    ideaCommunityPlugins = pkgs.dontRecurseIntoAttrs (jetbrainsPluginsFor pkgs.jetbrains.idea-community);
+    ideaUltimatePlugins = pkgs.dontRecurseIntoAttrs (jetbrainsPluginsFor pkgs.jetbrains.idea-ultimate);
+
+    clionWithPlugins = clionPlugins.jetbrainsWithPlugins;
+    ideaCommunityWithPlugins = ideaCommunityPlugins.jetbrainsWithPlugins;
+    ideaUltimateWithPlugins = ideaUltimatePlugins.jetbrainsWithPlugins;
+  };
+
+  libhl = pkgs.callPackage ../development/libraries/libhl { };
+
+  mopidy-subidy = pkgs.callPackage ../applications/audio/mopidy/subidy.nix {
+    python3Packages = pkgs.python3Packages // python3Packages;
+  };
+
+  pam_gnupg = pkgs.callPackage ../os-specific/linux/pam_gnupg { };
+
+  picom-animations = pkgs.picom.overrideAttrs (oldAttrs: {
+    pname = "picom-animations";
+    src = pkgs.fetchFromGitHub {
+      owner = "jonaburg";
+      repo = "picom";
+      rev = "d718c94";
+      sha256 = "165mc53ryyxn2ybkhikmk51ay3k18mvlsym3am3mgr8cpivmf2rm";
+    };
+  });
+
+  polybar = pkgs.polybar.overrideAttrs (oldAttrs: {
+    # Enables an extra button in formatting, indirectly allowing the use of
+    # the mouse forward and backward buttons.
+    patches = (oldAttrs.patches or [ ]) ++ [ ../applications/misc/polybar/9button.patch ];
+  });
+
+  python2Packages =
+    let
+      fixVersion =
+        { package
+        , version
+        , sha256
+        , extra ? (oldAttrs: { })
+        }: package.overrideAttrs (oldAttrs: rec {
+          inherit version;
+          src = pkgs.python2Packages.fetchPypi {
+            inherit (oldAttrs) pname;
+            inherit version sha256;
+          };
+        } // extra oldAttrs);
+    in
+    pkgs.recurseIntoAttrs rec {
+      colorama_0_3_3 = fixVersion {
+        package = pkgs.python2Packages.colorama;
+        version = "0.3.3";
+        sha256 = "1716z9pq1r5ys3nkg7wdrb3h2f9rmd0zdxpxzmx3bgwgf6xg48gb";
+      };
+
+      mutagen_1_30 = fixVersion {
+        package = pkgs.python2Packages.mutagen;
+        version = "1.30";
+        sha256 = "0kv2gjnzbj1w0bswmxm7wi05x6ypi7jk52s0lb8gw8s459j41gyd";
+        extra = oldAttrs: {
+          patches = [ ];
+        };
+      };
+
+      pyspotify_2_0_5 = fixVersion {
+        package = pkgs.python2Packages.pyspotify;
+        version = "2.0.5";
+        sha256 = "0y16c024rrvbvfdqj1n0k4b25b1nbza3i7kspg5b0ci2src1rm7v";
+      };
+
+      overlay = {
+        colorama = colorama_0_3_3;
+        mutagen = mutagen_1_30;
+        pyspotify = pyspotify_2_0_5;
+      };
+    };
+
+  python3Packages = pkgs.recurseIntoAttrs {
+    py-sonic = pkgs.python3.pkgs.callPackage ../development/python-modules/py-sonic { };
+  };
+
+  # The one in Nixpkgs still extracts the pre-built Debian package instead
+  # of building from source.
+  protonmailBridgePackages = pkgs.libsForQt512.callPackage ../applications/networking/protonmail-bridge {
+    inherit goModules;
+  };
+  protonmail-bridge = protonmailBridgePackages.protonmail-bridge;
+  protonmail-bridge-headless = protonmailBridgePackages.protonmail-bridge-headless;
+
+  radeon-profile-daemon = pkgs.libsForQt5.callPackage ../tools/misc/radeon-profile-daemon { };
+
+  samrewritten = pkgs.callPackage ../tools/misc/samrewritten { };
+
+  spotify-ripper = pkgs.callPackage ../tools/misc/spotify-ripper {
+    # NOTE: Not available in 20.03. Specifying it this way lets me cheat the
+    # build auto-failing on 20.03 because of the attribute not existing.
+    inherit (pkgs) fdk-aac-encoder;
+    python2Packages = pkgs.python2Packages // python2Packages.overlay;
+  };
+
+  zsh-z = pkgs.callPackage ../shells/zsh/zsh-z { };
+}