I'm surprised no-one's mentioned Estonia so far. I looked into it a while back, and it all seemed very easy to set up. You just needed to get an e-Resident ID (which was pretty simple) and there were cheap local companies to handle all the paperwork for you. Corporation tax was low, and importantly was only charged if you paid dividends: profits retained for future investment were not taxed. Perhaps I misunderstood things (I wound up not going ahead with it) or things have changed, but it looked like a great option, and they were marketing it for people exactly in your situation.