Better application switcher for Budgie desktop [duplicate]
Please note that the Alt+Tab behaviour is built into budgie-wm itself. I intend to add graphical switching in Budgie 11, which is currently in active development.
Budgie 12 will see deeper window management changes as we reduce our dependency on GNOME.
I strongly recommends rofi. It can be used as a window swticher and application runner. Realy neat.