helm-smex This package provides Helm integration for smex Config (require 'helm-smex) (global-set-key [remap execute-extended-command] #'helm-smex) (global-set-key (kbd "M-X") #'helm-smex-major-mode-commands) Sources https://github.com/hatschipuh/helm-better-defaults https://github.com/wasamasa/dotemacs/blob/master/unpublished/helm-smex.el