I've stripped Zorin OS down to its bare minimum... there's nothing else I can uninstall without running into dependency issues. I've often wondered, "If I wanted those default Zorin OS applications back, how would I go about doing that?"
Well, there's a way.
sudo aptitude -f
That will open a graphical application in the Terminal window... select 'Views', then "Recommended Packages" (you can use your mouse cursor).
All of the originally-installed packages are listed there.