Unity - The multiplatform game creation tools for everyone.
Terragen - Terragen is a scenery generator, created with the goal of generating photorealistic landscape...
Godot Engine - Feature-packed 2D and 3D open source game engine.
Vue - Create vast expanses of terrains, add trees, select the best point of view and render...
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
DreamScape - Plugin for 3ds Max that creates skies, clouds, ocean waves, boat wakes, naval dynamics and terrain.