Window-Switcher

dmenu is a fast and lightweight dynamic menu for X. It reads arbitrary text from stdin, and creates a menu with one item for each line. The user can then select an item, through the arrow keys or typing a part of the name, and the line is printed to stdout. dmenu_run is a wrapper that ships with the dmenu distribution that allows its use as an application launcher. Backlinks rofi

Rofi is a window switcher, run dialog, ssh-launcher and dmenu replacement. Rofi is mainly used on Xorg, but a patch has been made available so it can also be used in wayland.