Skype started in Denmark, as did Bitbucket, Zendesk, Podio, Unity, SteelSeries, AppHarbor, Tradeshift, Endomondo, Iconfinder, Momondo, TrustPilot and many other

Skype started in Denmark, as did Bitbucket, Zendesk, Podio, Unity, SteelSeries, AppHarbor, Tradeshift, Endomondo, Iconfinder, Momondo, TrustPilot and many others (http://starrt.dk/startups http://starrt.dk/startups). European software startups that need a huge infusion of capital tend to move some of their business to Silicon Valley while sometimes maintaining a development department back home (e.g., Unity is now headquartered in San Francisco while having its chief development department in Copenhagen, AFAIK).