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Many companies on the list are not startups, to name a few: skype, mysql, spil games, unity and rovio.

True, I used the term loosely, perhaps I should have said "tech companies founded by Europeans"

cool idea, but I can think of plenty of startups not listed

I know, you're right, but I thought I'd start with the ones I knew about and then let founders add their own startups to the list.