I use Prusa SL1 for support generation. It's very simple to use. ChiTubox support generation is awful, but I use it for slicing and think it works alright, but I don't have any experience with other slicing programs.
Both Maserati and Mangusta are files from the net. They are not printable , however, without a great deal of work to modify them to be printable. The Mangusta suspension, chassis, wheels, etc, was designed by me.