World Machine
World Machine 2 is a proven terrain generator for artists, game developers, visual effects studios and enthusiasts of all stripes.
L3DT
L3DT is a Windows application for generating terrain maps and textures. It is intended to help game developers and digital artists create vast high-quality 3D worlds.
Bryce
Bryce is an affordable 3D terrain generation tool. You can create mountains, skies, and oceans, as well as your own 3D models and props. With hundreds of presets included to help get you started, you can also create completely original 3D landscapes and scenes.
xaitment
xaitment's artificial intelligence (AI) software helps game and simulation developers create smarter, more lifelike characters - characters that move more intelligently, make better decisions and display more realistic behaviors. Our two software modules, xaitMap and xaitControl, are optimized for Windows, Linux, Xbox360, and PLAYSTATION3 and include runtime libraries and graphical tools to speed the creation of navigation meshes, intelligent pathfinding, movement behaviors, crowd simulations, game logic and advanced character behaviors.