Omnibox

Lightweight completion/selection system for Emacs.

[More screenshots]

Require Emacs >= 26.
Not compatible with Emacs in terminal

Usage:

(use-package omnibox
  :config
  (global-set-key (kbd "M-x") 'omnibox-M-x)
  (omnibox-setup))

It replaces Helm in my daily usage but the package is still under development so don't consider it stable.