Last year, Epic Games—the developer behind games like Bulletstorm and Gears of War—revealed the Unreal Development Kit: a version of the ubiquitous Unreal Engine 3 that anyone could download, for free. Use it for educational purposes or to release a noncommercial game and you wouldn't have to pay a cent. Use it for a commercial game and you'd need to pay an upfront fee of $99 and royalties on any revenue greater than $5,000. Epic has now raised the royalty threshold quite a bit: now you don't have to pay anything until you earn at least $50,000.
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