Paradox Interactive have announced that Fatshark's War of the Vikings that's currently available in beta through Steam's Early Access programme will appear in every Steam users library this weekend free of charge. It's available now and will be available until through December 8.
War of the Vikings is the follow-up to the medieval multiplayer war game that is War of the Roses (2012) from the same developer. For more on War of the Vikings read Mike Holmes' preview of the early access build.