App Switch - App Switch is a small utility app that is ment for mutiple display users.
rcmd - rcmd makes app switching instantaneous!When you have a lot of apps open, finding and switching to them might feel too slow using Command-Tab or the Dock.Hold down the right side |⌘ command| and press the first letter of the app name to focus it.
Charmstone - The quicker switcher launcher for macOS
Command-Tab Plus - Command-Tab Plus - Powerful and Customizable Applications and Windows Switcher for Mac OS X.
Lacona - Fast, simple, powerful keyboard-driven commands for Mac
SwitchGlass - Customizable app switcher for Mac