Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Terragen - Terragen is a scenery generator, created with the goal of generating photorealistic landscape...
Autodesk 3DS Max - 3ds Max is software for 3D modeling, animation, rendering, and visualization. Create stunning game enrivonments, design visualizations, and virtual reality experiences.
Vue - Create vast expanses of terrains, add trees, select the best point of view and render...
ZBrush - ZBrush is a digital sculpting and painting software solution.
DreamScape - Plugin for 3ds Max that creates skies, clouds, ocean waves, boat wakes, naval dynamics and terrain.