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How about xmonad? http://xmonad.org

A colleague of mine who wants to play with haskell tried it out and threw it in the too-hard basket - apparently to configure it you write haskell in the config files; not where he wanted to be trying his hand at the language.

Does the combination of Clojurescript+HTML count? [1]

[1] https://reagent-project.github.io/

Mobile apps: See the Apps section on http://cljsrn.org/ (and there are more mentioned in the talks).

For purely functional, have a look at Elm.

The Yi editor contains a minimal Emacs-like interface.

https://github.com/yi-editor/yi/