Zeal. Sadly doesn't have the any custom docset.

Specifically it is missing nixos/home-manager.

modules/applications/default.nix

@@ -11,6 +11,7 @@
     ./media.nix
     ./nextcloud.nix
     ./spotify.nix
+    ./zeal.nix
 
     ./i3
     ./sway

modules/applications/zeal.nix

@@ -0,0 +1,16 @@
+{ config, lib, pkgs, ... }:
+let
+  cfg = config.this.application.zeal;
+  graphical = config.this.graphical;
+in with lib; {
+  options = {
+    this.application.zeal.enable = mkOption {
+      default = graphical.enable;
+      type = with types; bool;
+    };
+  };
+
+  config = mkIf cfg.enable {
+    home-manager.users.james.home.packages = with pkgs; [ zeal ];
+  };
+}