Since the dev himself (Paul Speed, developer of Mythruna) is too humble to go around tooting his horn about his projects, I’m gonna go ahead and do it for him.
I encourage you to check out SimArboreal, an open source project for generating trees:
How’s that for programmer art!
It’s based on jMonkeyEngine (lwjgl), but you can also use it to export models to use them in the engine of your choice.
Library: https://github.com/Simsilica/SimArboreal
Editor: https://github.com/Simsilica/SimArboreal-Editor
The developer, Paul Speed, has been less active than usual lately, because life. But if the library sees some use - or better yet, pull requests (yay GitHub!) - I’m sure he’ll be very responsive, as he always is.
I’ll try to usher him over here if anyone has any questions for him.