Remember last week when we announced Epic Games had released its Unreal Development Kit for free to the masses? Well, it really took off: the company has just informed media over 50,000 installations have been recorded since then. More than that, users are spread across 130 countries and 4,500 cities, so we can expect lots of diverse creations in the years to come.

UDK is free for all, and offers licensing options for those wanting to take their works commercial.