This is a free tool I use to generate land. It is simplistic, very easy to use and very adjustable. This was built to be used with Game Maker to make landscapes to use in that game maker. But, it also generates .obj renders. Easy to translate that render to what you want. I translate the to direct x 9 which I can then use in RS. Awesome, because I can assign large or small areas with texture maps.And, it is free. Get it if you have the time because it is worth using saving you time and money.

Hard to find. I have it on my server and it is free: https://drive.google.com/file/d/1AblanwilMMHaSiPJkpV3P-ty72wOjrfo/view?usp=sharing

It is Google Cloud and so it is checked when uploaded and downloaded and so sent to you safe.