AmigaOS, obviously. And they also have a habit of referring to WinUAE as "their emulator" as though Mike Battilana wrote it instead of Toni Wilen etc. Their product is basically just a bundle of two things they didn't even write, UAE + AmigaOS. In the case of AmigaOS they have also taken deliberate actions to prevent further development of it.
But of course to point out any of this means I have to be being paid by Hyperion out of their secret bucketloads of money, apparently.
