Almost all of the software worth preserving is preserved. It may not be openly available (though odds are it will eventually be dumped openly on the net) but yo

Almost all of the software worth preserving is preserved. It may not be openly available (though odds are it will eventually be dumped openly on the net) but you can find pretty much anything you want if you put in some effort. It comes down to you getting access to one of many private repositories that are dedicated to software preservation.