What is the best free heightmap generator/source of UE4 compatible heightmaps?

Hi, how serious are you about the project? I have way out, advanced ideas about a future proof VR project in a similar vein so I’m interested in what you’d see as the outcome or open endedness of it if you know. Only concepts at the moment but I believe that only several advanced VR simulations will capture people’s attention enough in future so I’d like to share concepts with like minded people and perhaps start creating something spectacular.

Well, this isn’t a serious project, I’ve just been working on it in my free time, not planning to release it either. On the game’s website you can download ship models from the game, so I got the ship, started retexturing it for UE4, added a basic BP flight model, and it’s coming along really nicely now so I don’t know how long it’ll be till I decide to call it finished. It’s not going to be VR either because I don’t have any devices for that. I would definitely like to see some concepts of your project, if that’s OK.