I have also written an finicky to setup xdg-desktop-portal that let one choose #files using #emacs https://codeberg.org/rahguzar/filechooser , an Emacs interface to #hoogle https://codeberg.org/rahguzar/consult-hoogle

There is a (kind of in progress) major mode for #sagemath https://codeberg.org/rahguzar/sage-mode which hasn't seen much progress in a while because it is usable for its only user i.e. me.

Recently I managed to make produce a (humongous) #texinfo manual for Sage so that I can read it from Emacs https://github.com/sagemath/sage/issues/21734

@io if you're using #nix / #nixos you can easily spin up a local #hoogle:

For a #haskell project derivation `drv` instead of getting the dev environment with `drv.env` you do `drv.envFunc (withHoogle=true;)`.

Without a project, you do something like `nix-shell -p "haskellPackages.ghcWithHoogle (p: [])"`.

With either approach, once you're in the shell environment, start hoogle with `hoogle server --local`.