Unreal Script IDE is a useful utility developed in C# with using Visual Studio Shell , that makes it easier for UDK users to develop and debug UDK scripts.

UDK is Unreal Engine 3 – a complete professional development framework. All the tools you need to create great games, advanced visualizations and detailed 3D simulations on the PC and iOS. Give Unreal Script IDE a try to see what it's really capable of!