for appimage, see e.g. https://github.com/NixOS/nixpkgs/blob/master/pkgs/tools/networking/mockoon/default.nix

Maybe you’re talking from easy to use way. But Guix and Guile documentation are more cohesive in my experience, given that you’re into GNU Emacs. But I don’t think running GNU Guix System to be worth it.

How do you see these solutions by third-party? Wouldn’t that likely lead to go far away from the community and do commercialization and proprietary solutions?