Unreal Development Kit – Experience the Power and Potential of Unreal Engine 3 for Free

 

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.

Unity Game Engine – Create Games for Web, PC, Mac and iPhone for Free

Unity is a multiplatform game development tool, designed from the start to ease creation. A fully integrated professional application, Unity just happens to contain the most powerful engine this side of a million dollars.

Geocontrol2 – the Professional Terrain Generator

The revolutionary concept of GeoControl2 opens up totally new dimensions of creating virtual landscapes. The unique combination of more artistic tools and semi-scientific algorithms makes it possible to create realistic, breathtaking landsapes, based on conceptual layouts or on fantasie.