Originally Posted by press release

Unreal® Development Kit is the free version of the award-winning Unreal® Engine 3, the software development framework used to create computer and video games, 3D simulations, TV shows, films and more (see www.unrealtechnology.com for UE3 details).

Anyone can download UDK and work with the same game development tools used to create blockbuster games, architectural walkthroughs and digital movies. UDK ships with the latest version of the Unreal® Editor, with its unrivaled content creation toolset and rapid prototyping functionality.

UDK is free for noncommercial and educational use. Licensing terms are available to those who wish to sell UDK-powered games or to create commercial products or services for business use at www.udk.com/licensing.