nVidia has decided to release Unreal® Development Kit, the free version of the award-winning Unreal® Engine 3. as you may know, this engine is the source of amazing games such as Unreal, Mass Effect, Gears of Wars and many more.

Unreal Development Kit includes a wide list of tools that will give you the power to create amazing games, This is the list of what you'll find in the pack:

The Unreal Editor toolset, complete with fully integrated game editing environment.

Unreal Gemini multithreaded rendering system, including a powerful material system for creating complex real-time shaders on the fly.

Unreal Lightmass global illumination solver for high-quality static lighting.

State-of-the-art physics system, Unreal PhAT, powered by NVIDIA PhysX.

Unreal Kismet, an advanced visual scripting solution that facilitates rapid prototyping of ideas and gameplay mechanics.

AnimSet Viewer and AnimTree Editor, which give animators precise control over every muscle and bone movement.

Unreal Matinee, which includes movie director-class tools for creating in-game cut scenes and gorgeous cinematics.

UnrealScript, a fully integrated, high-level object-oriented programming language.

Built-in Internet and LAN networking support for up to 64 players.

Audio control through UnrealEd’s Visual Sound Cue Editor, plus support for major audio compression schemes; 3D sound positioning, spatialization and attenuation; multi-channel playback, and much more.

Unreal Cascade particle effects system for implementing explosions, fog, fire and smoke. Module-based system gives real-time previews of visual effects.

Terrain building tool for placing and customizing vegetation, structures and countless in-game points of interest.

Integrations with leading game development middleware including PhysX, SpeedTree, FaceFX and Bink Video.

Furthermore, UDK includes demo content from Unreal Tournament 3 consisting of four maps; deathmatch, team deathmatch, and vehicle capture the flag gametypes; one robot character; three weapons; and four vehicles.

If you like creating and ediing games, you should try Unreal Development Kit, you know it's the best choice you can find for free.