UDK is Unreal Engine 3 – the complete professional development framework. All the tools you need to create great games, advanced visualizations and detailed 3D simulations. The best tools in the industry are in your hands.
This engine is wicked sick, it may have a steep learning curve even with tons of user-made tutorials, yet. The flexibility it haves makes it the best option in the market to start a new entry into the world of video game developing.