As expected, Samsung Galaxy S4 is getting Galaxy S5 applications like S Note, WatchOn, Calculator, Gear Fit Manager, Galaxy Gear Manager, S Health and S Translator now. Just install them like normal apk. Or wait for Galaxy S5 next month for the actual experience. By the way, you need KitKat TouchWiz ROM in order to use them. Therefore, they should work on Galaxy Note 3 too.
Download them here.