Quitting all the open apps on your Mac involves a lot of Command-Q typing or building your own Automator action, or now just installing Quit All from Amico Apps. This cool app lets you quit every running app on your Mac from the menu bar with a mouse click, and you can view and quit hidden processes, too. You can also force quit frozen apps, or quit just the one or two apps you don’t need running. Quit All costs US$5 and is available for download at the Amico Apps website.
Check It Out: Quit Every Running App on Your Mac the Easy Way with Amico App’s Quit All
Or you can set up an app, action, workflow or service in Automator to quit all open apps. In my case I have opted to leave a few apps running.