Unreal Engine offers a fully integrated editing environment through the renowned Unreal Editor. All of the engine’s key tools are accessible through UnrealEd. The new Unreal Content Browser makes managing assets like meshes, materials, sounds, and animations easier than ever.
UDK’s multi-threaded rendering system, Gemini, gives you a 64-bit HDR rendering pipeline. The raw power behind UDK’s rendering system will push your creations to new levels. Your work has never seemed as alive as it is with UDK.
UDK gives you complete animation flexibility. Organize animations and meshes with the AnimSet Viewer. Create AnimTrees to play within Unreal Matinee. UDK’s skeletal animation system gives support for up to four bones per vertex and allows for blending dozens of animations at once.
It's a tool that provides documentation that help you Windows applications.
It includes tools for designing and running "point and click" adventure games.
KDM 10 is a tool for the quick development of kits to be used in FIFA 10.
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UDK will take advantage of all the other gaming Engines available to such a level that you as a [new/experienced] user will be addicted depending on your level of interest or ability to use the package.