Contexts - Switch between application windows effortlessly — with Fast Search, a better Command-Tab, a Sidebar or even a quick gesture. Free trial available.
Witch - Welcome to the world of W. i. t. c. h.
VistaSwitcher - VistaSwitcher is an elegant and powerful task management utility for Windows OS.
Hyperswitch - HyperSwitch provides a compelling alternative to HyperDock for keyboard junkies. What's New
pekwm - pekwm is a window manager that once up on a time was based on the aewm++ window manager, but it has...
picom - A lightweight compositor for X11 (previously a compton fork).