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.

App Switch - App Switch is a small utility app that is ment for mutiple display users.

Command-Tab Plus - Command-Tab Plus - Powerful and Customizable Applications and Windows Switcher for Mac OS X.

SwitchGlass - Customizable app switcher for Mac

Switch for macOS - Keyboard-driven commands to navigate your mac apps faster.

YipYip! - YipYip lets you get in the flow and fly through the web 10x faster!It's an always-on search & keyboard navigation assistant that turns Gmail (and any other website) into a keyboard-first product.It's also open source!