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.
Hyperswitch - HyperSwitch provides a compelling alternative to HyperDock for keyboard junkies. What's New
Switcheroo - The simplest and fastest ALT-TAB replacement.
pekwm - pekwm is a window manager that once up on a time was based on the aewm++ window manager, but it has...
HyperKeys - Unleash the power of your keyboard by letting you bind ANY action to a shortcut. It's open-source and fully extendable. You can code you own actions or use one from the community !