the Marvel TFs are mecha (Transtector in my noggin ) made by Tony Stark. Well his own is at least, the bio vaguely indicates more, but its not hard to imagine he made the others, and the villains are stolen tech or some crap.
Quote Originally Posted by Iron Man Bio
The very first battle suit developed by IRON MAN was his own. It is the only one of the mechs built so far that can fly in both modes. It is also extremely powerful in battle, with a huge array of lasers, missiles and other weapons. IRON MAN also incorporated an override system that lets him take remote control of most of the other battle suits he has built.