I've been building a procedural world maker in Houdini recently. It is still a work in progress, but I think it's at a good place to show a little.
It's fun to see massive landscapes generate fairly quickly in Unreal Engine with this too.
This can generate natural paths between chosen "settlement" locations and naturally flat areas. All sort of foliage, rock and decor scattering. It can also generate cliff-side meshes with different detail options. Plenty more in the works, as well.