What can this do Generate 3D Terrain Procedurally Export Terrain as OBJ You can write and test your own shaders An Inbuilt IDE for shaders A Node based as well as Layer based workflow
TerraForge3D is a Free And Opensource Procedural Terrain And Modelling Tool. This is a free alternative to paid softwares like Gaea or World Machine. This has got everything you need to make any sort of terrain you want to. This is very easy to learn and use!