Pixel Mine's UnrealScript Studio development environment for UnrealEngine3 is now available for commercial license from the Pixel Mine website. UnrealScript Studio includes the first UnrealScript 3 source-level debugger to successfully tie into the familiar Visual Studio experience. It includes support for breakpoints, stepping, locals, user watches, the Immediate window, and the Quick Watch window. Even subtle features like hovering over a variable in the source code to see its value while debugging have been implemented.
Pixel Mine is offering UnrealScript Studio under a dual end-user license: a Commercial license and a 100% free, strictly non-commercial license, which can be used by the Unreal modding community as well as students and institutions of higher learning. More information about UnrealScript Studio can be found here.