emacs-which-key 3.3.1 Display available key bindings in popup

emacs-which-key is a minor mode for Emacs that displays the key bindings following your currently entered incomplete command (a prefix) in a popup. For example, after enabling the minor mode if you enter C-x and wait for the default of 1 second, the minibuffer will expand with all of the available key bindings that follow C-x (or as many as space allows given your settings).