Love the idea. Reminds me of an old app that I think was called Concentrate. Would be interesting if a “bunch” could also be closed en masse. Also, if one could be launched through Alfred or a menu bar.
Funny you should mention quitting apps. Watch for an update this afternoon. I might someday make it able to directly open bunch files so it could be used as a drop zone, Alfred/Launchbar tool, etc. But not today. It scratches a very specific desire for me, and that's to have a multi-launcher in my Dock.
Remarkbox